Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Face Value	$ 284,473	$ 272,629
Senior Notes | 10% Senior Secured Notes due 2021
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Face Value	9,427	9,427
Payment in Kind (PIK) Note | 10% Senior Secured PIK Notes due 2021
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Face Value	275,046	263,202
Fair Value
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Long-term debt, fair value	226,999	206,023
Fair Value | Senior Notes | 10% Senior Secured Notes due 2021
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Long-term debt, fair value	7,580	7,306
Fair Value | Payment in Kind (PIK) Note | 10% Senior Secured PIK Notes due 2021
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Long-term debt, fair value	219,419	198,717
Carrying Value
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Long-term debt, fair value	284,351	281,398
Carrying Value | Senior Notes | 10% Senior Secured Notes due 2021
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Long-term debt, fair value	9,788	9,821
Carrying Value | Payment in Kind (PIK) Note | 10% Senior Secured PIK Notes due 2021
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis
Long-term debt, fair value	274,563	271,577
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	(718)	443
Significant Unobservable Inputs (Level 3)
Derivatives, Fair Value [Line Items]
Commodity derivatives at fair value	$ 0	$ 0