STOCKHOLDERS' EQUITY - AOCI Changes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Changes in accumulated other comprehensive income, net of tax, by component
Balances	$ 1,151,401	$ 929,067	$ 828,593
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	(2,779)	3,404	2,509
Balances	1,242,363	1,151,401	929,067
Accumulated Other Comprehensive Income
Changes in accumulated other comprehensive income, net of tax, by component
Balances	7,103	3,699	1,190
Other comprehensive income (loss) before reclassifications	(1,791)	3,966
Amounts reclassified from accumulated other comprehensive income	(988)	(562)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	(2,779)	3,404	2,509
Balances	4,324	7,103	3,699
Unrecognized Net Periodic Benefit Credit
Changes in accumulated other comprehensive income, net of tax, by component
Balances	6,896	4,160
Other comprehensive income (loss) before reclassifications	(847)	3,298
Amounts reclassified from accumulated other comprehensive income	(988)	(562)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	(1,835)	2,736
Balances	5,061	6,896	4,160
Interest Rate Swap
Changes in accumulated other comprehensive income, net of tax, by component
Balances	2,604	309
Other comprehensive income (loss) before reclassifications	(1,341)	2,295
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	(1,341)	2,295
Balances	1,263	2,604	309
Foreign Currency Translation
Changes in accumulated other comprehensive income, net of tax, by component
Balances	(2,397)	(770)
Other comprehensive income (loss) before reclassifications	397	(1,627)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	397	(1,627)
Balances	$ (2,000)	$ (2,397)	$ (770)