Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Schedule of Fair Value of Derivatives Financial Instruments and Long-Term Senior Notes (Details)

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Fair Value Measurements - Schedule of Fair Value of Derivatives Financial Instruments and Long-Term Senior Notes (Details) - Fair Value, Inputs, Level 2 - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value of commodity derivative contracts $ 6,060 $ 7,672
Revolving bank credit facility [1] 288,000  
8.50% Senior Notes    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Long-term debt, senior notes fair value [1] 108,000 324,000
9.00% Term Loan due 2020    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Long-term debt, term loan fair value [1] $ 144,000 $ 217,500
[1] The long-term debt items are reported on the Condensed Consolidated Balance Sheets at their carrying value as described in Note 5.