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Restatement of Previously Issued Financial Statements - Condensed Consolidated Statements of Cash Flows (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Net loss $ (142,406)us-gaap_ProfitLoss [1] $ (539,215)us-gaap_ProfitLoss [1]
Changes in operating assets and liabilities (81,147)us-gaap_IncreaseDecreaseInOperatingCapital (48,965)us-gaap_IncreaseDecreaseInOperatingCapital
As Reported    
Net loss (134,085)us-gaap_ProfitLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 (531,259)us-gaap_ProfitLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Changes in operating assets and liabilities $ (89,468)us-gaap_IncreaseDecreaseInOperatingCapital
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 $ (56,921)us-gaap_IncreaseDecreaseInOperatingCapital
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
[1] Guarantor and Consolidated direct operating expenses have been restated to reflect accrual of the CO2 delivery shortfall penalty. See Note 2.