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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 360,465us-gaap_CashAndCashEquivalentsAtCarryingValue $ 554,831us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash 15,985us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 15,926us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Receivables:    
Joint interest billings 49,870us-gaap_OilAndGasJointInterestBillingReceivablesCurrent 60,592us-gaap_OilAndGasJointInterestBillingReceivablesCurrent
Oil sales 49,913us-gaap_AccountsReceivableNetCurrent 61,731us-gaap_AccountsReceivableNetCurrent
Other 53,446us-gaap_OtherReceivablesNetCurrent 41,221us-gaap_OtherReceivablesNetCurrent
Inventories 73,750us-gaap_InventoryNet 55,354us-gaap_InventoryNet
Prepaid expenses and other 29,677us-gaap_PrepaidExpenseAndOtherAssetsCurrent 25,278us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Deferred tax assets 34,462us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 32,268us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Derivatives 163,869us-gaap_DerivativeAssetsCurrent 163,275us-gaap_DerivativeAssetsCurrent
Total current assets 831,437us-gaap_AssetsCurrent 1,010,476us-gaap_AssetsCurrent
Property and equipment:    
Oil and gas properties, net 1,810,421us-gaap_OilAndGasPropertySuccessfulEffortMethodNet 1,773,186us-gaap_OilAndGasPropertySuccessfulEffortMethodNet
Other property, net 10,733us-gaap_PropertyPlantAndEquipmentOtherNet 11,660us-gaap_PropertyPlantAndEquipmentOtherNet
Property and equipment, net 1,821,154us-gaap_PropertyPlantAndEquipmentNet 1,784,846us-gaap_PropertyPlantAndEquipmentNet
Other assets:    
Restricted cash 16,125us-gaap_RestrictedCashAndCashEquivalentsNoncurrent 16,125us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Long-term receivables - joint interest billings 18,321us-gaap_OilAndGasJointInterestBillingReceivablesNoncurrent 14,174us-gaap_OilAndGasJointInterestBillingReceivablesNoncurrent
Deferred financing costs, net of accumulated amortization of $35,999 and $33,389 at March 31, 2015 and December 31, 2014 respectively 46,143us-gaap_DeferredFinanceCostsNoncurrentNet 48,753us-gaap_DeferredFinanceCostsNoncurrentNet
Long-term deferred tax assets 11,237us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 9,182us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Derivatives 77,475us-gaap_DerivativeAssetsNoncurrent 89,210us-gaap_DerivativeAssetsNoncurrent
Total assets 2,821,892us-gaap_Assets 2,972,766us-gaap_Assets
Current liabilities:    
Accounts payable 126,114us-gaap_AccountsPayableCurrent 184,400us-gaap_AccountsPayableCurrent
Accrued liabilities 141,672us-gaap_AccruedLiabilitiesCurrent 201,967us-gaap_AccruedLiabilitiesCurrent
Deferred tax liability 63,211us-gaap_DeferredTaxLiabilitiesCurrent 61,683us-gaap_DeferredTaxLiabilitiesCurrent
Derivatives 973us-gaap_DerivativeLiabilitiesCurrent 721us-gaap_DerivativeLiabilitiesCurrent
Total current liabilities 331,970us-gaap_LiabilitiesCurrent 448,771us-gaap_LiabilitiesCurrent
Long-term liabilities:    
Long-term debt 794,434us-gaap_LongTermDebtNoncurrent 794,269us-gaap_LongTermDebtNoncurrent
Derivatives 7,821us-gaap_DerivativeLiabilitiesNoncurrent 68us-gaap_DerivativeLiabilitiesNoncurrent
Asset retirement obligations 46,604us-gaap_AssetRetirementObligationsNoncurrent 44,023us-gaap_AssetRetirementObligationsNoncurrent
Deferred tax liability 346,465us-gaap_DeferredTaxLiabilitiesNoncurrent 337,961us-gaap_DeferredTaxLiabilitiesNoncurrent
Other long-term liabilities 9,648us-gaap_OtherLiabilitiesNoncurrent 8,715us-gaap_OtherLiabilitiesNoncurrent
Total long-term liabilities 1,204,972us-gaap_LiabilitiesNoncurrent 1,185,036us-gaap_LiabilitiesNoncurrent
Shareholders' equity:    
Preference shares, $0.01 par value; 200,000,000 authorized shares; zero issued at March 31, 2015 and December 31, 2014      
Common shares, $0.01 par value; 2,000,000,000 authorized shares; 393,149,315 and 392,443,048 issued at March 31, 2015 and December 31, 2014, respectively 3,931us-gaap_CommonStockValue 3,924us-gaap_CommonStockValue
Additional paid-in capital 1,885,326us-gaap_AdditionalPaidInCapitalCommonStock 1,860,190us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated deficit (573,759)us-gaap_RetainedEarningsAccumulatedDeficit (494,850)us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income 573us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax 767us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Treasury stock, at cost, 5,560,579 and 5,555,088 shares at March 31, 2015 and December 31, 2014, respectively (31,121)us-gaap_TreasuryStockValue (31,072)us-gaap_TreasuryStockValue
Total shareholders' equity 1,284,950us-gaap_StockholdersEquity 1,338,959us-gaap_StockholdersEquity
Total liabilities and shareholders' equity $ 2,821,892us-gaap_LiabilitiesAndStockholdersEquity $ 2,972,766us-gaap_LiabilitiesAndStockholdersEquity