COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 749,772
Net-current period other comprehensive income (loss)	840	$ (1,097)
Ending balance	735,815	738,178
Unrealized Gains and Losses on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	693	256
Other comprehensive income (loss) before reclassifications	451	(688)
Amounts reclassified from accumulated other comprehensive loss	0	0
Net-current period other comprehensive income (loss)	451	(688)
Ending balance	1,144	(432)
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	99	1,585
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	(1)	(43)
Net-current period other comprehensive income (loss)	(1)	(43)
Ending balance	98	1,542
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(3,815)	(3,303)
Other comprehensive income (loss) before reclassifications	390	(366)
Amounts reclassified from accumulated other comprehensive loss	0	0
Net-current period other comprehensive income (loss)	390	(366)
Ending balance	(3,425)	(3,669)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(3,023)	(1,462)
Other comprehensive income (loss) before reclassifications	841	(1,054)
Amounts reclassified from accumulated other comprehensive loss	(1)	(43)
Net-current period other comprehensive income (loss)	840	(1,097)
Ending balance	$ (2,183)	$ (2,559)