COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS (Changes in Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (10,060)	$ (3,155)	$ (3,737)	$ (2,163)
Other comprehensive income (loss) before reclassifications	(1,775)	(147)	(8,139)	(1,116)
Amounts reclassified from accumulated other comprehensive loss	18	53	59	30
Net-current period other comprehensive income (loss)	(1,757)	(94)	(8,080)	(1,086)
Ending balance	(11,817)	(3,249)	(11,817)	(3,249)
Unrealized Gains and Losses on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(6,506)	(21)	(1,165)	890
Other comprehensive income (loss) before reclassifications	(731)	7	(6,072)	(904)
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Net-current period other comprehensive income (loss)	(731)	7	(6,072)	(904)
Ending balance	(7,237)	(14)	(7,237)	(14)
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(633)	(1,664)	(674)	(1,641)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive loss	18	53	59	30
Net-current period other comprehensive income (loss)	18	53	59	30
Ending balance	(615)	(1,611)	(615)	(1,611)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(2,921)	(1,470)	(1,898)	(1,412)
Other comprehensive income (loss) before reclassifications	(1,044)	(154)	(2,067)	(212)
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Net-current period other comprehensive income (loss)	(1,044)	(154)	(2,067)	(212)
Ending balance	$ (3,965)	$ (1,624)	$ (3,965)	$ (1,624)