Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income
Balance, beginning	$ 326,204	$ 419,476	$ 209,357
Balance, ending	429,171	326,204	419,476
Amounts reclassified from AOCI	0	0	0
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income
Balance, beginning	1,260	1,894	2,589
Other comprehensive gain	2,048
Balance, ending	3,308	1,260	$ 1,894
Unrealized Gain (Loss) on Marketable Securities
Accumulated Other Comprehensive Income
Balance, beginning	(1,336)
Other comprehensive gain	2,048
Balance, ending	712	(1,336)
Foreign Currency Items
Accumulated Other Comprehensive Income
Balance, beginning	2,596
Balance, ending	$ 2,596	$ 2,596