STOCKHOLDERS' EQUITY - AOCI Changes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Changes in accumulated other comprehensive income, net of tax, by component
Balances	$ 1,242,363	$ 1,151,401
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	(979)	(717)
Balances	1,222,733	1,205,859
Accumulated Other Comprehensive Income
Changes in accumulated other comprehensive income, net of tax, by component
Balances	4,324	7,103
Other comprehensive loss before reclassifications	(792)	(470)
Amounts reclassified from accumulated other comprehensive income	(187)	(247)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	(979)	(717)
Balances	3,345	6,386
Unrecognized Net Periodic Benefit Credit
Changes in accumulated other comprehensive income, net of tax, by component
Balances	5,061	6,896
Amounts reclassified from accumulated other comprehensive income	(187)	(247)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	(187)	(247)
Balances	4,874	6,649
Interest Rate Swap
Changes in accumulated other comprehensive income, net of tax, by component
Balances	1,263	2,604
Other comprehensive loss before reclassifications	(366)	(452)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	(366)	(452)
Balances	897	2,152
Foreign Currency Translation
Changes in accumulated other comprehensive income, net of tax, by component
Balances	(2,000)	(2,397)
Other comprehensive loss before reclassifications	(426)	(18)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	(426)	(18)
Balances	$ (2,426)	$ (2,415)