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Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Mar. 31, 2013
Debt Instrument [Line Items]      
Less unamortized debt issuance costs $ 2,986,000 $ 3,689,000  
Total debt (221,214,000) (209,911,000)  
Less current maturities 400,000 400,000  
Total long-term debt 220,814,000 209,511,000  
Senior Subordinated 6.25% Notes      
Debt Instrument [Line Items]      
Less unamortized debt issuance costs     $ 3,755,000
Total debt $ (210,000,000) (210,000,000)  
Senior Subordinated Notes, interest rate 6.25%   6.25%
Revolving credit facility      
Debt Instrument [Line Items]      
Total debt $ (11,000,000) 0  
Other debt      
Debt Instrument [Line Items]      
Total debt $ (3,200,000) $ (3,600,000)