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Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total debt $ 518,711 $ 507,906
Unamortized debt premium 1,176 1,583
Debt issuance cost (3,121) (4,222)
Less: current maturities (1,167) (1,156)
Long-term debt 517,544 506,750
Senior unsecured notes due October 2021    
Debt Instrument [Line Items]    
Total debt 400,000 400,000
Senior secured revolving credit facility    
Debt Instrument [Line Items]    
Total debt 119,000 108,446
Other debt    
Debt Instrument [Line Items]    
Total debt $ 1,656 $ 2,099