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Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Senior notes $ 45,000 $ 45,000
Revolving credit facility 0 0
Total long-term debt 45,000 45,000
Less: Current maturities 0 0
Total maturities due after one year $ 45,000 $ 45,000