ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
AOCI rollforward
Balance	$ (17,706)	$ (23,223)
Change during the period:
Before-tax amount	136	(712)
Reclassification adjustment, net of taxes:
Amortization of net loss	153	732
Total activity for the period	289	20
Balance	(17,417)	(23,203)
Pension Adjustment
AOCI rollforward
Balance	(15,181)	(20,908)
Reclassification adjustment, net of taxes:
Amortization of net loss	153	732
Total activity for the period	153	732
Balance	(15,028)	(20,176)
Foreign Currency Translation
AOCI rollforward
Balance	(2,525)	(2,315)
Change during the period:
Before-tax amount	136	(712)
Reclassification adjustment, net of taxes:
Total activity for the period	136	(712)
Balance	$ (2,389)	$ (3,027)