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Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Oct. 31, 2013
Debt Instrument [Line Items]      
Total debt $ 488,024 $ 518,711  
Unamortized debt premium 1,075 1,176  
Debt issuance cost (2,845) (3,121)  
Less: current maturities (108) (1,167)  
Long-term debt 487,916 517,544  
6.25% Senior Notes due October 2021      
Debt Instrument [Line Items]      
Total debt $ 400,000 400,000  
Debt stated interest rate 6.25%   6.25%
Other debt      
Debt Instrument [Line Items]      
Total debt $ 794 1,656  
2017 Credit Facility | Senior secured revolving credit facility      
Debt Instrument [Line Items]      
Total debt $ 89,000 $ 119,000