Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
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
Dec. 31, 2015
Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value of commodity derivative contracts $ 7,672  
Revolving bank credit facility   $ 447,000
8.50% Senior Notes    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Long-term debt, senior notes fair value 324,000 $ 594,000
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 $ 217,500