LONG-TERM DEBT AND FINANCING ARRANGEMENTS - Summary (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Long-term debt obligations
Long-term debt	$ 225,405	$ 225,532
Less current portion	56,049	50,615
Long-term debt, less current portion	169,356	174,917
Credit Facility
Long-term debt obligations
Long-term debt	$ 50,000	50,000
Interest rate (as a percent)	2.80%
Credit Facility | Interest rate swap agreement
Long-term debt obligations
Amount of borrowings covered by the interest rate swap	$ 50,000	$ 50,000
Effective fixed interest rate on hedged borrowings (as a percent)	1.56%	3.12%
Notes payable
Long-term debt obligations
Long-term debt	$ 175,405	$ 175,530
Weighted-average interest rate (as a percent)	2.50%
Finance lease obligations
Long-term debt obligations
Long-term debt		$ 2