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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 749,772
Net-current period other comprehensive income (loss)	$ 25	$ 4,197	1,761	$ 2,470
Ending balance	671,976	749,213	671,976	749,213
Unrealized Gains and Losses on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1,382	(749)	693	256
Other comprehensive income (loss) before reclassifications	246	3,005	935	2,000
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0	0
Net-current period other comprehensive income (loss)	246	3,005	935	2,000
Ending balance	1,628	2,256	1,628	2,256
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	99	1,500	99	1,585
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	(2)	(43)	(2)	(128)
Net-current period other comprehensive income (loss)	(2)	(43)	(2)	(128)
Ending balance	97	1,457	97	1,457
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(2,768)	(3,940)	(3,815)	(3,303)
Other comprehensive income (loss) before reclassifications	(219)	1,235	828	598
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0	0
Net-current period other comprehensive income (loss)	(219)	1,235	828	598
Ending balance	(2,987)	(2,705)	(2,987)	(2,705)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,287)	(3,189)	(3,023)	(1,462)
Other comprehensive income (loss) before reclassifications	27	4,240	1,763	2,598
Amounts reclassified from accumulated other comprehensive income (loss)	(2)	(43)	(2)	(128)
Net-current period other comprehensive income (loss)	25	4,197	1,761	2,470
Ending balance	$ (1,262)	$ 1,008	$ (1,262)	$ 1,008