COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (2,559)	$ (5,044)	$ (1,462)	$ (7,344)
Other comprehensive income (loss) before reclassifications	(588)	(692)	(1,642)	1,628
Amounts reclassified from accumulated other comprehensive loss	(42)	(21)	(85)	(41)
Net-current period other comprehensive income (loss)	(630)	(713)	(1,727)	1,587
Ending balance	(3,189)	(5,757)	(3,189)	(5,757)
Unrealized Gains and Losses on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(432)	(3,151)	256	(5,323)
Other comprehensive income (loss) before reclassifications	(317)	(144)	(1,005)	2,028
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Net-current period other comprehensive income (loss)	(317)	(144)	(1,005)	2,028
Ending balance	(749)	(3,295)	(749)	(3,295)
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1,542	842	1,585	862
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive loss	(42)	(21)	(85)	(41)
Net-current period other comprehensive income (loss)	(42)	(21)	(85)	(41)
Ending balance	1,500	821	1,500	821
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(3,669)	(2,735)	(3,303)	(2,883)
Other comprehensive income (loss) before reclassifications	(271)	(548)	(637)	(400)
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Net-current period other comprehensive income (loss)	(271)	(548)	(637)	(400)
Ending balance	$ (3,940)	$ (3,283)	$ (3,940)	$ (3,283)