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Derivatives - Additional Information (Details) (USD $) | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Mississippian Trust I | Dec. 31, 2013 Permian Trust | Dec. 31, 2013 Mississippian Trust II | Apr. 30, 2013 Senior Floating Rate Notes due 2014 Fixed To Floating Interest Rate Swap Through April 1st 2013 | Dec. 31, 2013 Commodity Derivatives | Sep. 30, 2013 Commodity Derivatives | Jun. 30, 2013 Commodity Derivatives | Mar. 31, 2013 Commodity Derivatives | Dec. 31, 2012 Commodity Derivatives | Sep. 30, 2012 Commodity Derivatives | Jun. 30, 2012 Commodity Derivatives | Mar. 31, 2012 Commodity Derivatives | Dec. 31, 2013 Commodity Derivatives | Dec. 31, 2012 Commodity Derivatives | Dec. 31, 2011 Commodity Derivatives | Dec. 31, 2013 Interest rate swaps | Dec. 31, 2012 Interest rate swaps | Dec. 31, 2011 Interest rate swaps | Dec. 31, 2013 Cash Commodity Derivatives | Dec. 31, 2012 Cash Commodity Derivatives | Dec. 31, 2011 Cash Commodity Derivatives | Dec. 31, 2013 Cash Commodity Derivatives Derivative Contracts Early Settlements | Dec. 31, 2013 Cash Interest rate swaps | Dec. 31, 2012 Cash Interest rate swaps | Dec. 31, 2011 Cash Interest rate swaps | Dec. 31, 2012 Noncash Commodity Derivatives Amendment
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, maturity date |  |  |  |  |  |  | Apr. 01, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liability, notional amount |  |  |  |  |  |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, fixed interest rate |  |  |  |  |  |  | 6.69% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative agreement effective date |  |  |  | Apr. 01, 2011 | Aug. 01, 2011 | Apr. 01, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivative contracts covering volumes of oil and gas production, date |  |  |  | Dec. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss (gain) on derivative contracts | 47,123,000 | (241,419,000) | (44,075,000) |  |  |  |  | (22,900,000) | 132,800,000 | (103,700,000) | 40,900,000 | (19,600,000) | 193,500,000 | (669,900,000) | 254,600,000 | 47,123,000 | (241,419,000) | (44,075,000) |  |  |  | (3,200,000) | (100,700,000) | 37,600,000 | 29,600,000 |  |  |  | 117,100,000
Interest expense | $ 270,234,000 | $ 303,349,000 | $ 237,332,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000 | $ 1,200,000 | $ 3,200,000 |  |  |  |  | $ 2,400,000 | $ 9,200,000 | $ 9,400,000 |

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- Definition Agreement effective date. + References No definition available. + Details
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- Definition Date through which commodity derivatives cover oil and natural gas production for Trust. + References No definition available. + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Interest and debt related expenses associated with nonoperating financing activities of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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