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Long-term Debt and Related Matters - Schedule of Long-term Debt Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
Revolving credit facility $ 36,538 $ 44,777
Finance leases and financing agreements 255 247
Total 36,793 45,024
Less current maturities (129) (119)
Long-term portion $ 36,664 $ 44,905