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Derivatives - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) institution	Jun. 30, 2015 USD ($)	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure
Loss (gain) on derivative contracts	$ 7,969,000	$ 33,004,000	$ 5,161,000	$ (16,823,000)
Number of counterparties to open derivative contracts | institution			2
Senior Notes | 8.75% Senior Notes due 2020
Derivative Instruments and Hedging Activities Disclosure
Long-term debt, fixed interest rate	8.75%		8.75%		8.75%
Aggregate outstanding principal amount	$ 100,000,000		$ 100,000,000
Commodity Derivatives
Derivative Instruments and Hedging Activities Disclosure
Loss (gain) on derivative contracts	8,000,000	33,000,000	5,200,000	(16,800,000)
Cash receipts, upon settlement of derivative contract	32,400,000	$ 74,400,000	$ 58,000,000	$ 211,300,000
Commodity Derivatives | Cash Early Settlements
Derivative Instruments and Hedging Activities Disclosure
Cash receipts, upon settlement of derivative contract	$ 11,500,000

X

- Definition

Debt Instrument, Aggregate Outstanding Principal Amount, Threshold Adjusting Maturity Date Of Secured Notes

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Derivative Instruments and Hedging Activities Disclosure [Line Items]

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- Definition

The amount of cash received during the period on settlement of a hedge.

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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=56946850&loc=SL5624171-113959

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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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