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
Jun. 30, 2015
Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivatives $ 1,079  
Revolving bank credit facility [1] 260,000 $ 447,000
8.50% Senior Notes due June 2019    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value of derivatives and long-term debt [1] 633,060 $ 594,000
9.00% Term Loan due 2020    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value of derivatives and long-term debt [1] $ 296,250  
[1] The long-term debt items are reported on the Condensed Consolidated Balance Sheets at their carrying value as described in Note 5.