STOCKHOLDERS' EQUITY - AOCI Changes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Changes in accumulated other comprehensive income, net of tax, by component
Balances	$ 1,242,363	$ 1,151,401	$ 929,067
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	(4,052)	(2,779)	3,404
Balances	1,314,362	1,242,363	1,151,401
Accumulated Other Comprehensive Income
Changes in accumulated other comprehensive income, net of tax, by component
Balances	4,324	7,103	3,699
Other comprehensive income (loss) before reclassifications	(3,310)	(1,791)
Amounts reclassified from accumulated other comprehensive income	(742)	(988)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	(4,052)	(2,779)	3,404
Balances	272	4,324	7,103
Unrecognized Net Periodic Benefit Credit
Changes in accumulated other comprehensive income, net of tax, by component
Balances	5,061	6,896
Other comprehensive income (loss) before reclassifications	(116)	(847)
Amounts reclassified from accumulated other comprehensive income	(742)	(988)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	(858)	(1,835)
Balances	4,203	5,061	6,896
Interest Rate Swap
Changes in accumulated other comprehensive income, net of tax, by component
Balances	1,263	2,604
Other comprehensive income (loss) before reclassifications	(1,263)	(1,341)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	(1,263)	(1,341)
Balances		1,263	2,604
Foreign Currency Translation
Changes in accumulated other comprehensive income, net of tax, by component
Balances	(2,000)	(2,397)
Other comprehensive income (loss) before reclassifications	(1,931)	397
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	(1,931)	397
Balances	$ (3,931)	$ (2,000)	$ (2,397)