Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Amortized Cost
Amortized Cost	$ 331,429	$ 369,809
Gross Unrealized Losses
Gross Unrealized Losses	(3,013)	(702)
Fair Value
Fair Value	328,416	369,107
U.S. government and municipal obligations
Amortized Cost
Maturing in one year or less	152,518	80,674
Maturing after one year through three years	3,887	51,319
Amortized Cost	156,405	131,993
Gross Unrealized Losses
Maturing in one year or less	(1,494)	(133)
Maturing after one year through three years	(17)	(184)
Gross Unrealized Losses	(1,511)	(317)
Fair Value
Maturing in one year or less	151,024	80,541
Maturing after one year through three years	3,870	51,135
Fair Value	154,894	131,676
Corporate debt securities
Amortized Cost
Maturing in one year or less	149,304	170,034
Maturing after one year through three years	25,720	67,782
Amortized Cost	175,024	237,816
Gross Unrealized Gains
Maturing in one year or less	0
Maturing after one year through three years	0
Gross Unrealized Gains	0
Gross Unrealized Losses
Maturing in one year or less	(829)	(28)
Maturing after one year through three years	(673)	(357)
Gross Unrealized Losses	(1,502)	(385)
Fair Value
Maturing in one year or less	148,475	170,006
Maturing after one year through three years	25,047	67,425
Fair Value	$ 173,522	$ 237,431