Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income
Balance	$ 209,357	$ 94,026	$ 124,060
Balance	419,476	209,357	94,026
Amounts reclassified from AOCI	0	0	0
Unrealized Gain (Loss) on Marketable Securities, net of tax
Accumulated Other Comprehensive Income
Balance	(7)
Other comprehensive loss	(695)
Balance	(702)	(7)
Foreign Currency Items
Accumulated Other Comprehensive Income
Balance	2,596
Balance	2,596	2,596
Accumulated Other Comprehensive Income.
Accumulated Other Comprehensive Income
Balance	2,589	2,619	2,583
Other comprehensive loss	(695)
Balance	$ 1,894	$ 2,589	$ 2,619