Fair Value Measurements (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Quoted Prices in Active Markets (Level 1)
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Commodity Derivatives Fair Value	$ 0	$ 0
Significant Other Observable Inputs (Level 2)
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Commodity Derivatives Fair Value	8,631,000	(1,096,000)
Significant Unobservable Inputs (Level 3)
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Commodity Derivatives Fair Value	0	0
10% Senior Notes
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Stated interest rate (as a percent)	10.00%
Estimated fair value of the Notes	350,000,000
10% Senior Notes \| Significant Other Observable Inputs (Level 2)
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Estimated fair value of the Notes	$ 301,000,000	$ 364,000,000

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