STOCKHOLDERS' EQUITY - AOCI Components (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Changes in accumulated other comprehensive income, net of tax, by component
Balances	$ 1,151,401	$ 929,067
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	(717)	1,624
Balances	1,205,859	983,172
Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income, net of tax, by component
Balances	7,103	3,699
Other comprehensive income (loss) before reclassifications	(470)	1,765
Amounts reclassified from accumulated other comprehensive income	(247)	(141)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	(717)	1,624
Balances	6,386	5,323
Unrecognized Net Periodic Benefit Credit
Changes in accumulated other comprehensive income, net of tax, by component
Balances	6,896	4,160
Amounts reclassified from accumulated other comprehensive income	(247)	(141)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	(247)	(141)
Balances	6,649	4,019
Interest Rate Swap
Changes in accumulated other comprehensive income, net of tax, by component
Balances	2,604	309
Other comprehensive income (loss) before reclassifications	(452)	1,458
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	(452)	1,458
Balances	2,152	1,767
Foreign Currency Translation
Changes in accumulated other comprehensive income, net of tax, by component
Balances	(2,397)	(770)
Other comprehensive income (loss) before reclassifications	(18)	307
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	(18)	307
Balances	$ (2,415)	$ (463)