COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (1,462)	$ (7,344)
Other comprehensive income (loss) before reclassifications	(1,054)	2,320
Amounts reclassified from accumulated other comprehensive loss	(43)	(20)
Net-current period other comprehensive income (loss)	(1,097)	2,300
Ending balance	(2,559)	(5,044)
Unrealized Gains and Losses on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	256	(5,323)
Other comprehensive income (loss) before reclassifications	(688)	2,172
Amounts reclassified from accumulated other comprehensive loss	0	0
Net-current period other comprehensive income (loss)	(688)	2,172
Ending balance	(432)	(3,151)
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1,585	862
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	(43)	(20)
Net-current period other comprehensive income (loss)	(43)	(20)
Ending balance	1,542	842
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(3,303)	(2,883)
Other comprehensive income (loss) before reclassifications	(366)	148
Amounts reclassified from accumulated other comprehensive loss	0	0
Net-current period other comprehensive income (loss)	(366)	148
Ending balance	$ (3,669)	$ (2,735)