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FINANCING ARRANGEMENTS AND LONG-TERM DEBT - Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
FINANCING ARRANGEMENTS AND LONG-TERM DEBT    
Senior secured credit facility $ 78,775 $ 86,863
Debt issuance costs (924) (1,040)
Long-term debt, net 77,851 85,823
Less current installments on long term debt 4,300 11,000
Long-term debt $ 73,551 $ 74,823