CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited)
Net income	$ 6,875	$ 46,248
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of $0 tax in each of the three months ended March 31, 2023 and 2022	148	(269)
Unrealized gain (loss) on marketable securities, net of $0 tax in each of the three months ended March 31, 2023 and 2022	2,172	(4,181)
Amortization of defined benefit pension items, net of tax of ($4) and $3 in the three months ended March 31, 2023 and 2022, respectively	(20)	18
Total other comprehensive income (loss)	2,300	(4,432)
TOTAL COMPREHENSIVE INCOME	$ 9,175	$ 41,816