COMPONENTS OF THE COMPANY'S CONSOLIDATED BALANCE SHEETS (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 752,241	$ 755,216	$ 912,032
Other comprehensive income (loss)	(1,561)	5,882	(3,607)
Ending balance	749,772	752,241	755,216
Unrealized Gains and Losses on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	256	(5,323)	(1,165)
Other comprehensive income (loss) before reclassifications	437	5,579	(4,158)
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Other comprehensive income (loss)	437	5,579	(4,158)
Ending balance	693	256	(5,323)
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1,585	862	(674)
Other comprehensive income (loss) before reclassifications	(1,319)	811	1,459
Amounts reclassified from accumulated other comprehensive loss	(167)	(88)	77
Other comprehensive income (loss)	(1,486)	723	1,536
Ending balance	99	1,585	862
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(3,303)	(2,883)	(1,898)
Other comprehensive income (loss) before reclassifications	(512)	(420)	(985)
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Other comprehensive income (loss)	(512)	(420)	(985)
Ending balance	(3,815)	(3,303)	(2,883)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,462)	(7,344)	(3,737)
Other comprehensive income (loss) before reclassifications	(1,394)	5,970	(3,684)
Amounts reclassified from accumulated other comprehensive loss	(167)	(88)	77
Other comprehensive income (loss)	(1,561)	5,882	(3,607)
Ending balance	$ (3,023)	$ (1,462)	$ (7,344)