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Long-Term Debt (Schedule of Long-term Debt Instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Revolving credit facility $ 89,389 $ 74,008
Capital leases and financing agreements 793 974
Total 90,182 74,982
Less current maturities (609) (629)
Long-term portion $ 89,573 $ 74,353