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Additional Balance Sheet Details (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]    
Commodity derivatives settlement receivables $ 59,755us-gaap_AccountsAndOtherReceivablesNetCurrent $ 0us-gaap_AccountsAndOtherReceivablesNetCurrent
Trade accounts receivable, net 45,407us-gaap_AccountsReceivableNet 53,737us-gaap_AccountsReceivableNet
Federal income tax receivable, net 37,652us-gaap_IncomeTaxesReceivable 0us-gaap_IncomeTaxesReceivable
Other receivables 14,141us-gaap_OtherReceivablesNetCurrent 24,558us-gaap_OtherReceivablesNetCurrent
Total $ 156,955us-gaap_AccountsReceivableNetCurrent $ 78,295us-gaap_AccountsReceivableNetCurrent