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FINANCING ARRANGEMENTS AND LONG-TERM DEBT - Long-term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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FINANCING ARRANGEMENTS AND LONG-TERM DEBT |  |
Senior secured credit facility | $ 86,863 | $ 99,113
Debt issuance costs | (1,040) | (1,651)
Long-term debt, net | 85,823 | 97,462
Less current installments on long term debt | 11,000 | 8,250
Long-term debt | $ 74,823 | $ 89,212

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