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Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Senior notes $ 120,000 $ 120,000
Revolving credit facility 4,726 12,317
Capital Lease Obligations 596 1,488
Total long-term debt 125,322 133,805
Less: Current maturities (25,596) (26,488)
Total maturities due after one year $ 99,726 $ 107,317