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)

v3.5.0.2
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
Jun. 30, 2016
Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value of commodity derivative contracts $ 594 $ 7,672
Fair value of commodity derivative contracts 117  
Revolving bank credit facility [1] 148,000  
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] 222,750 324,000
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] $ 183,000 $ 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.