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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 30, 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 125,395 206,023
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 4,155 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 121,240 198,717
Carrying Value    
Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis    
Long-term debt, fair value 284,328 281,398
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 9,707 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 274,621 271,577
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 0 443
Significant Unobservable Inputs (Level 3)    
Derivatives, Fair Value [Line Items]    
Commodity derivatives at fair value $ 0 $ 0