COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (3,189)	$ (5,757)	$ (1,462)	$ (7,344)
Other comprehensive income (loss) before reclassifications	4,240	48	2,598	1,676
Amounts reclassified from accumulated other comprehensive income (loss)	(43)	(21)	(128)	(62)
Net-current period other comprehensive income (loss)	4,197	27	2,470	1,614
Ending balance	1,008	(5,730)	1,008	(5,730)
Unrealized Gains and Losses on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(749)	(3,295)	256	(5,323)
Other comprehensive income (loss) before reclassifications	3,005	455	2,000	2,483
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0	0
Net-current period other comprehensive income (loss)	3,005	455	2,000	2,483
Ending balance	2,256	(2,840)	2,256	(2,840)
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1,500	821	1,585	862
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	(43)	(21)	(128)	(62)
Net-current period other comprehensive income (loss)	(43)	(21)	(128)	(62)
Ending balance	1,457	800	1,457	800
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(3,940)	(3,283)	(3,303)	(2,883)
Other comprehensive income (loss) before reclassifications	1,235	(407)	598	(807)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0	0
Net-current period other comprehensive income (loss)	1,235	(407)	598	(807)
Ending balance	$ (2,705)	$ (3,690)	$ (2,705)	$ (3,690)