Face (par) amount of debt instrument at time of issuance.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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Fair Value Measurements (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Jul. 03, 2013	Aug. 19, 2010
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Book value			$ 200,000,000
Quoted Prices in Active Markets (Level 1)
Derivatives, Fair Value [Line Items]
Commodity derivatives at fair value	0	0
Significant Other Observable Inputs (Level 2)
Derivatives, Fair Value [Line Items]
Commodity derivatives at fair value	(4,514,000)	(1,096,000)
Significant Unobservable Inputs (Level 3)
Derivatives, Fair Value [Line Items]
Commodity derivatives at fair value	0	0
Senior Notes [Member] \| 10% Senior Notes [Member]
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Interest rate of Senior Notes	10.00%	10.00%	10.00%	10.00%
Estimated fair value of the Notes	373,000,000	364,000,000
Book value	$ 350,000,000	$ 350,000,000	$ 200,000,000	$ 150,000,000