Document and Entity Information
Aggregate par or stated value of issued common units.
Common Units.
Common units, 100,000,000 units authorized; zero and 19,069,662 issued at December 31, 2011 and 2010, respectively
Accmulated Amortization Of Deferred Finance Costs And Other Assets
Represents the amount of accumulated amortization of deferred financing costs and other assets on the reporting date by the entity.
Deferred financing costs and other assets, accumulated amortization (in dollars)
The maximum numbers of common units permitted to be issued by an entity's charter and bylaws.
Common Units Authorized
Common units, units authorized
Common Units Issued
Total number of common units of an entity that have been sold or granted to owners (includes common units that were issued, repurchased and remain in the treasury). These units represent capital invested by the firm's owners, and may be all or only a portion of the number of units authorized. Units issued include units outstanding and shares held in the treasury.
Common units, units issued
Stock Issued During Period Shares Share Based Compensation Forfeited And Cancelled
Number of shares (or other type of equity) forfeited and cancelled during the period.
Relinquishments of profit units (in shares)
Accrete convertible preferred units to redemption amount
Represents the accretion of preferred units to redemption amount.
Accrete of Preferred Units to Redemption
Cash Paid for [Abstract]
Cash paid for:
Deemed Payment and Termination of Notes Receivable
Deemed payment and termination of notes receivable
The value of deemed payment and termination of notes receivable in noncash investing or financing transactions.
Notes receivable applied to FPSO purchase
Notes Receivable Applied
The fair value of notes receivable applied in noncash investing activities.
Amendment Description
Acquisition of FPSO and Notes Receivable
Accounts Payable and Accrued Liabilities Disclosure [Text Block]
Accounts Payable and Accrued Liabilities
Amendment Flag
Acquisition of FPSO and Notes Receivable
Notes Receivable Disclosure [Text Block]
The entire disclosure for a significant property acquisition completed during the period. It also includes the disclosure for notes receivable applied to the purchase price.
Jubilee Field Unitization
Jubilee Field Unitization Disclosure [Text Block]
Jubilee Field Unitization
Entire disclosure on the Jubilee Field Unitization.
Joint Interest Billings
Joint Interest Billings
Oil and Gas Joint Interest Billing Receivable Disclosure [Text Block]
Represents all disclosure related to joint interest billings in one text block.
Current Fiscal Year End Date
Accounts Receivable, Net, Current
Oil sales
Document Period End Date
Entity Well-known Seasoned Issuer
Entity Voluntary Filers
Entity Current Reporting Status
Entity Filer Category
Entity Public Float
Entity Registrant Name
Entity Central Index Key
Entity Common Stock, Shares Outstanding
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Type
Additional Paid in Capital, Common Stock
Additional paid-in capital
Depreciation
Depletion and depreciation
Unrealized Gain (Loss) on Derivatives
Derivative related activity
Long-term receivables - joint interest billings, allowance (in dollars)
Allowance for Doubtful Accounts Receivable, Noncurrent
Amortization of Financing Costs
Amortization - deferred financing costs
Asset Retirement Obligation Disclosure [Text Block]
Asset Retirement Obligations
Asset Retirement Obligations, Noncurrent
Asset retirement obligations
CONSOLIDATED BALANCE SHEETS
Basic (in dollars per share)
Earnings Per Share, Basic
Cash and Cash Equivalents, at Carrying Value
Cash and cash equivalents
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period
Interest
Interest Paid
(Increase) decrease in inventories
Increase (Decrease) in Inventories
Increase in prepaid expenses and other
Increase (Decrease) in Prepaid Expense and Other Assets
Decrease in receivables
Increase (Decrease) in Receivables
Changes in assets and liabilities:
Increase (Decrease) in Operating Capital [Abstract]
Decrease in accounts payable
Increase (Decrease) in Accounts Payable
Increase (decrease) in accrued liabilities
Increase (Decrease) in Accrued Liabilities
Commitments and Contingencies
Commitments and Contingencies Disclosure [Text Block]
Common Stock, Shares Authorized
Common shares, authorized shares
Common Stock, Shares, Issued
Common shares, issued shares
Common Stock, Value, Issued
Common shares, $0.01 par value; 2,000,000,000 authorized shares; 390,865,673 and 390,530,946 issued at March 31, 2012 and December 31, 2011, respectively
Comprehensive loss
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Condensed Financial Information of Parent Company Only Disclosure [Text Block]
Schedule I Condensed Parent Company Financial Statements
Convertible Preferred Stock [Member]
Convertible preferred units
Oil and Gas Production Expense
Oil and gas production
Liabilities, Current
Total current liabilities
Current liabilities:
Liabilities, Current [Abstract]
Debt Disclosure [Text Block]
Debt
Deferred income taxes
Deferred Income Tax Expense (Benefit)
Deferred Tax Assets, Net, Current
Current deferred tax assets
Deferred Tax Liabilities, Noncurrent
Deferred tax liability
Derivative Assets, Noncurrent
Derivatives
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Derivative Financial Instruments
Derivative Liabilities, Current
Derivatives
Derivative Liabilities, Noncurrent
Derivatives
Diluted (in dollars per share)
Earnings Per Share, Diluted
Share-based Compensation
Equity-based compensation
Exploration Expense
Exploration expenses
Payments of Financing Costs
Deferred financing costs
Gain (Loss) on Derivative Instruments, Net, Pretax
Derivatives, net
Unrealized Gain (Loss) on Cash Flow Hedging Instruments
Change in fair value of cash flow hedges
Gains (Losses) on Extinguishment of Debt
Loss on extinguishment of debt
General and administrative
General and Administrative Expense
CONSOLIDATED STATEMENTS OF OPERATIONS
Income Taxes
Income Tax Disclosure [Text Block]
Restricted cash
Increase (Decrease) in Restricted Cash
Interest Expense
Interest expense
Inventory, Net
Inventories
Liabilities and Equity
Total liabilities and shareholders' equity
Liabilities and shareholders' equity
Liabilities and Equity [Abstract]
Long-term Debt, Current Maturities
Current maturities of long-term debt
Long-term Debt, Excluding Current Maturities
Long-term debt
Loss on cash flow hedge included in operations
Loss on cash flow hedge included in operations
Loss on Cash Flow Hedge Ineffectiveness
Net cash provided by (used in) operating activities
Net Cash Provided by (Used in) Operating Activities, Continuing Operations
Operating activities
Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract]
Net loss
Net loss
Net loss
Net Income (Loss) Attributable to Parent
Net Income (Loss) Available to Common Stockholders, Basic
Net loss attributable to common shareholders/unit holders
Nonoperating Income (Expense)
Other expenses, net
Liabilities, Noncurrent
Total long-term liabilities
Liabilities, Noncurrent [Abstract]
Long-term liabilities:
Oil and Gas Property, Successful Effort Method, Accumulated Depreciation, Depletion and Amortization
Oil and gas properties, accumulated depletion (in dollars)
Oil and Gas Property, Successful Effort Method, Net
Oil and gas properties, net of accumulated depletion of $174,315 and $135,622, respectively
Revenues
Total revenues and other income
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax
Derivatives, net
Other Nonoperating Income
Interest income
Other property
Payments to Acquire Other Property, Plant, and Equipment
401(k) Plan
Pension and Other Postretirement Benefits Disclosure [Text Block]
Preferred Stock, Shares Authorized
Preference shares, authorized shares
Preferred Stock, Shares Issued
Preference shares, issued shares
Other Preferred Stock Dividends and Adjustments
Accretion to redemption value of convertible preferred units
Preferred Stock, Par or Stated Value Per Share
Preference shares, par value (in dollars per share)
Net proceeds from issuance of units
Proceeds from Issuance of Convertible Preferred Stock
Proceeds from Issuance Initial Public Offering
Net proceeds from the initial public offering
Proceeds from Issuance of Long-term Debt
Borrowings under long-term debt
Property, Plant and Equipment, Net
Property and equipment - net
Property and Equipment
Provision for Doubtful Accounts
Doubtful accounts expense
Oil and gas assets
Payments to Acquire Oil and Gas Property and Equipment
Payments for (Proceeds from) Investments
Notes receivable
Receivables:
Receivables, Net, Current [Abstract]
Repayments of Long-term Debt
Payments on long-term debt
Restricted Cash and Cash Equivalents, Current
Restricted cash
Results of Operations, Dry Hole Costs
Unsuccessful well costs
Unsuccessful well costs
Retained Earnings (Accumulated Deficit)
Accumulated deficit
Revenue, Net [Abstract]
Revenues and other income:
Other Revenue, Net
Other income
Oil and Gas Sales Revenue
Oil and gas revenue
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Schedule II Valuation and Qualifying Accounts
Series B Convertible preferred units
Series B Preferred Stock [Member]
Series C Convertible preferred units
Series C Preferred Stock [Member]
Series A Convertible preferred units
Series A Preferred Stock [Member]
Significant Accounting Policies [Text Block]
Accounting Policies
CONSOLIDATED STATEMENTS OF CASH FLOWS
CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY
Shareholders' equity:
Stockholders' Equity Attributable to Parent [Abstract]
Supplemental cash flow information
Supplemental Cash Flow Information [Abstract]
Income Taxes Paid
Income taxes
Temporary Equity [Abstract]
Convertible preferred units, 100,000,000 units authorized:
Assets, Current
Total current assets
Current assets:
Assets, Current [Abstract]
Treasury Stock
Treasury Stock [Member]
Diluted (in shares)
Weighted Average Number of Shares Outstanding, Diluted
Basic (in shares)
Weighted Average Number of Shares Outstanding, Basic
Restricted Cash and Cash Equivalents, Noncurrent
Restricted cash
Common Units
General Partner [Member]
Common Shares
Common Stock [Member]
Property, Plant and Equipment Disclosure [Text Block]
Property and Equipment
Property and equipment:
Property, Plant and Equipment, Net [Abstract]
Assets
Total assets
Notes, Loans and Financing Receivable, Net, Current
Notes
Other Assets, Noncurrent [Abstract]
Other assets:
Deferred Finance Costs, Noncurrent, Net
Deferred financing costs and other assets, net of accumulated amortization of $8,776 and $6,582, respectively
Other Liabilities, Noncurrent
Other long-term liabilities
Deferred Tax Assets, Net, Noncurrent
Long-term deferred tax assets
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Equity-based Compensation
Scenario, Unspecified [Domain]
Statement [Table]
Statement, Scenario [Axis]
Assets
Assets [Abstract]
Statement [Line Items]
Statement
Convertible Preferred Units
Fair Value Measurements
Fair Value Disclosures [Text Block]
Temporary Equity, Carrying Amount
Convertible preferred units
Temporary Equity, Shares Authorized
Convertible preferred units, units authorized
Temporary Equity, Shares Issued
Convertible preferred units, units issued
Investing activities
Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract]
Financing activities
Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract]
Net cash used in investing activities
Net Cash Provided by (Used in) Investing Activities, Continuing Operations
Net cash provided by (used in) financing activities
Net Cash Provided by (Used in) Financing Activities, Continuing Operations
Class of Stock [Domain]
Treasury Stock, Value
Treasury stock, at cost, 650,937 and 649,818 shares at March 31, 2012 and December 31, 2011, respectively
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax
Accumulated other comprehensive income
Increase (Decrease) in Shareholders' Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Period Increase (Decrease)
Net Income (Loss) Per Share
Net loss per share attributable to common shareholders:
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest
Loss before income taxes
Class of Stock [Axis]
Common Stock, Par or Stated Value Per Share
Common shares, par value (in dollars per share)
Treasury Stock, Shares
Treasury stock, shares
Total shareholders' equity
Balance
Balance
Stockholders' Equity Attributable to Parent
Income Tax Expense (Benefit)
Income tax expense (benefit)
Income tax expense (benefit)
Suspended Well Costs Disclosure [Text Block]
Suspended Well Costs
Preferred Stock, Value, Issued
Preference shares, $0.01 par value; 200,000,000 authorized shares; zero issued at March 31, 2012 and December 31, 2011
Incentive from Lessor
Leasehold improvement allowance
Statement, Equity Components [Axis]
Additional Paid-in Capital
Additional Paid-in Capital [Member]
Accumulated Deficit
Retained Earnings [Member]
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Member]
Equity Component [Domain]
Stock Issued During Period, Value, New Issues
Common shares issued at initial public offering, net of offering costs
Stock Issued During Period, Value, Restricted Stock Award, Forfeitures
Restricted stock forfeitures
Stock Issued During Period, Shares, New Issues
Common shares issued at initial public offering, net of offering costs (in shares)
Stock Issued During Period, Shares, Period Increase (Decrease)
Stock Issued During Period, Value, Conversion of Units
Common and restricted shares issued upon corporate reorganization
Stock Issued During Period, Shares, Conversion of Units
Common and restricted shares issued upon corporate reorganization (in shares)
Costs and Expenses [Abstract]
Costs and expenses:
Costs and Expenses
Total costs and expenses
Earnings Per Share, Pro Forma [Abstract]
Shares, Issued
Balance (in shares)
Balance (in shares)
Earnings Per Share [Text Block]
Net Income (Loss) Per Share
Weighted average number of shares used to compute net loss per share:
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Depletion, depreciation and amortization
Depreciation, Depletion and Amortization
Oil and Gas Joint Interest Billing Receivables, Current
Joint interest billings
Oil and Gas Joint Interest Billing Receivables, Noncurrent
Long-term receivables - joint interest billings, net of allowance of zero and $39.8 million, respectively
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Nature of Operations [Text Block]
Organization
Accounts Payable, Current
Accounts payable
Accrued Liabilities, Current
Accrued liabilities
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Portion Attributable to Parent
Income tax benefit
Other comprehensive income:
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Other comprehensive income
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition
Equity-based compensation
Capitalized Exploratory Well Cost, Charged to Expense
Unsuccessful well costs
Prepaid Expense and Other Assets, Current
Prepaid expenses and other
Net increase in cash and cash equivalents
Net Cash Provided by (Used in) Continuing Operations
Accounts Payable and Accrued Liabilities
Organization
Preferred Stock [Text Block]
Convertible Preferred Units
Commitments and Contingencies
Stock Issued During Period, Value, Other
Issuance of C1 units
Issuance of C1 units (in shares)
Stock Issued During Period, Shares, Other
Asset Retirement Obligations
Income Taxes
Schedule I Condensed Parent Company Financial Statements
Fair Value Measurements
Subsequent Events
Subsequent Events [Text Block]
Debt
Property, Plant and Equipment, Other, Accumulated Depreciation
Other property, accumulated depreciation (in dollars)
Property, Plant and Equipment, Other, Net
Other property, net of accumulated depreciation of $8,953 and $8,068, respectively
401(k) Plan
Derivative Financial Instruments
Equity-based Compensation
Suspended Well Costs
Accounting Policies
Subsequent Events
Schedule II Valuation and Qualifying Accounts
Other
Other Noncash Income (Expense)
Other Receivables, Net, Current
Other
Stock Issued During Period, Value, Share-based Compensation, Gross
Issuance of profit units
Stock Issued During Period, Value, Share-based Compensation, Forfeited
Relinquishments of profit units
Stock Issued During Period, Shares, Share-based Compensation, Gross
Issuance of profit units (in shares)
Noncash Investing and Financing Items [Abstract]
Non-cash activities:
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax
Reclassification adjustments for derivative losses included in net loss
Business Combinations [Abstract]
Acquisition of FPSO
Business Combination Disclosure [Text Block]
Acquisition of FPSO
Acquisition of FPSO Disclosure [Text Block]
The entire disclosure for acquisition of FPSO completed during the period. It also includes the disclosure for notes receivable applied to the purchase price.
Acquisition of FPSO
Restricted stock awards
Stock Issued During Period, Value, Restricted Stock Award, Gross
Restricted stock awards (in shares)
Stock Issued During Period, Shares, Restricted Stock Award, Gross
Gain Loss On Derivatives Net
Derivative related activity
The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures and forward contracts, held at each balance sheet date.
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax
Reclassification adjustments for derivative losses included in net loss