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Debt (Schedule of Long-Term Debt) (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total debt $ 396,252,000 $ 396,269,000
Unamortized debt premium 2,294,000 2,395,000
Debt issuance cost (6,149,000) (6,425,000)
Less: current maturities (82,000) (253,000)
Long-term debt 396,170,000 396,016,000
6.25% Senior Notes due October 2021    
Debt Instrument [Line Items]    
Total debt 400,000,000 400,000,000
Senior secured revolving credit facility    
Debt Instrument [Line Items]    
Total debt 0 0
Other debt    
Debt Instrument [Line Items]    
Total debt $ 107,000 $ 299,000