ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance	$ 948,662
Other comprehensive income/(loss), net of tax	(2,968)	$ (23,944)	$ (14,445)
Balance	1,070,134	948,662
Tax (benefit)/expense	1,800	1,500	(1,100)
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance	(179,600)	(152,200)	(140,200)
Other comprehensive income/(loss) before reclassifications	(11,700)	(27,400)	(12,000)
Amounts reclassified from accumulated other comprehensive income/(loss)	0	0	0
Other comprehensive income/(loss), net of tax	(11,700)	(27,400)	(12,000)
Balance	(191,300)	(179,600)	(152,200)
Pension and Post-Retirement Plan Benefit Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance	(49,000)	(52,600)	(50,000)
Other comprehensive income/(loss) before reclassifications	4,900	0	0
Amounts reclassified from accumulated other comprehensive income/(loss)	4,000	3,600	(2,600)
Other comprehensive income/(loss), net of tax	8,900	3,600	(2,600)
Balance	(40,100)	(49,000)	(52,600)
AOCI Including Portion Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance	(228,600)	(204,800)	(190,200)
Other comprehensive income/(loss) before reclassifications	(6,800)	(27,400)	(12,000)
Amounts reclassified from accumulated other comprehensive income/(loss)	4,000	3,600	(2,600)
Other comprehensive income/(loss), net of tax	(2,800)	(23,800)	(14,600)
Balance	$ (231,400)	$ (228,600)	$ (204,800)