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Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Capital leases $ 2,065 $ 2,215
Total debt 552,065 552,215
Less: current portion (997) (951)
Total long-term debt 546,817 546,832
7.500 % Senior Unsecured Notes Due 2022    
Debt Instrument [Line Items]    
Senior unsecured notes 550,000 550,000
Debt issuance costs (8,719) (9,092)
Premium on senior unsecured notes $ 4,468 $ 4,660