CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited)
Net income	$ 14,793	$ 55,824	$ 21,668	$ 102,072
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of $0 tax in each of the three and six months ended June 30, 2023 and 2022	(548)	(754)	(400)	(1,023)
Unrealized gain (loss) on marketable securities, net of $0 tax in each of the three and six months ended June 30, 2023 and 2022	(144)	(1,160)	2,028	(5,341)
Amortization of defined benefit pension items, net of tax of ($4) and ($7) in the three and six months ended June 30, 2023, respectively, and $0 and $3 in the three and six months ended June 30, 2022, respectively	(21)	23	(41)	41
Total other comprehensive income (loss)	(713)	(1,891)	1,587	(6,323)
TOTAL COMPREHENSIVE INCOME	$ 14,080	$ 53,933	$ 23,255	$ 95,749