Accumulated Other Comprehensive Income (loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated other comprehensive income loss
Beginning balance	$ 1,047,849	$ 976,255
Other comprehensive income (loss)	(1,561)	1
Ending balance	1,124,789	1,010,904
Accumulated Other Comprehensive Income (loss).
Accumulated other comprehensive income loss
Beginning balance	(1,317)	141
Other comprehensive income (loss)	(1,561)	1
Ending balance	(2,878)	142
Unrealized Gains (Losses) on Available-for-Sale Investments
Accumulated other comprehensive income loss
Beginning balance	(207)
Other comprehensive income (loss)	(489)
Ending balance	(696)
Foreign Currency Translation
Accumulated other comprehensive income loss
Beginning balance	(1,110)	141
Other comprehensive income (loss)	(1,072)	1
Ending balance	$ (2,182)	$ 142