Cash, Cash Equivalents and Investment Debt Securities (Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Total available for sale securities, Less than 12 months, Fair Value	$ 357,296	$ 295,608
Total available for sale securities Less than 12 months, Gross Unrealized Holding Losses	(2,362)	(296)
Total available for sale securities, More than 12 months, Fair Value	19,110	0
Total available for sale securities more than 12 months, Gross Unrealized Holding Losses	(111)	0
Available-for-sale securities, Total Fair Value	376,406	295,608
Available-for-sale securities, Total Gross Unrealized Losses	(2,473)	(296)
Commercial paper
Total available for sale securities, Less than 12 months, Fair Value	107,837	81,464
Total available for sale securities Less than 12 months, Gross Unrealized Holding Losses	(254)	(49)
Total available for sale securities, More than 12 months, Fair Value	0	0
Total available for sale securities more than 12 months, Gross Unrealized Holding Losses	0	0
Available-for-sale securities, Total Fair Value	107,837	81,464
Available-for-sale securities, Total Gross Unrealized Losses	(254)	(49)
Corporate debt securities
Total available for sale securities, Less than 12 months, Fair Value	224,195	196,120
Total available for sale securities Less than 12 months, Gross Unrealized Holding Losses	(1,906)	(245)
Total available for sale securities, More than 12 months, Fair Value	19,110	0
Total available for sale securities more than 12 months, Gross Unrealized Holding Losses	(111)	0
Available-for-sale securities, Total Fair Value	243,305	196,120
Available-for-sale securities, Total Gross Unrealized Losses	(2,017)	(245)
Municipal bonds
Total available for sale securities, Less than 12 months, Fair Value		5,027
Total available for sale securities Less than 12 months, Gross Unrealized Holding Losses		(1)
Total available for sale securities, More than 12 months, Fair Value		0
Total available for sale securities more than 12 months, Gross Unrealized Holding Losses		0
Available-for-sale securities, Total Fair Value		5,027
Available-for-sale securities, Total Gross Unrealized Losses		(1)
U.S. government agency bonds
Total available for sale securities, Less than 12 months, Fair Value	10,383
Total available for sale securities Less than 12 months, Gross Unrealized Holding Losses	(118)
Total available for sale securities, More than 12 months, Fair Value	0
Total available for sale securities more than 12 months, Gross Unrealized Holding Losses	0
Available-for-sale securities, Total Fair Value	10,383
Available-for-sale securities, Total Gross Unrealized Losses	(118)
U.S Treasury securities
Total available for sale securities, Less than 12 months, Fair Value	14,881	12,997
Total available for sale securities Less than 12 months, Gross Unrealized Holding Losses	(84)	(1)
Total available for sale securities, More than 12 months, Fair Value	0	0
Total available for sale securities more than 12 months, Gross Unrealized Holding Losses	0	0
Available-for-sale securities, Total Fair Value	14,881	12,997
Available-for-sale securities, Total Gross Unrealized Losses	$ (84)	$ (1)

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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