Financial Instruments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2023 USD ($) position
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Proceeds from investments sold	$ 248,500
Gross realized gains (losses)	(900)
Number of investments, unrealized loss position | position		19
Number of investments, unrealized loss position less than 12 months | position		0
Fair value		$ 115,372
Unrealized loss		(2,745)
Amortized Cost
Less than or equal to one year		216,548
Greater than one year but less than five years		23,065
Total		239,613
Fair Value
Less than or equal to one year		215,095
Greater than or equal to one year but less than five years		21,787
Total		236,882
Available-for-sale securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	914,494	881,708
Gross Unrealized Gain	1	14
Gross Unrealized Loss	(16,103)	(2,745)
Estimated Fair Value	898,392	878,977
Gross unrealized loss	16,103	2,745
Liquid demand deposits
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	466,091	642,095
Estimated Fair Value	466,091	642,095
U.S. Treasury securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	358,385	201,522
Gross Unrealized Gain		14
Gross Unrealized Loss	(12,328)	(1,118)
Estimated Fair Value	346,057	200,418
Fair value		78,908
Unrealized loss		(1,118)
Gross unrealized loss	12,328	1,118
Corporate bonds and notes
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	24,045
Gross Unrealized Loss	(516)
Estimated Fair Value	23,529
Gross unrealized loss	516
Municipal securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	65,973	38,091
Gross Unrealized Gain	1
Gross Unrealized Loss	(3,259)	(1,627)
Estimated Fair Value	62,715	36,464
Fair value		36,464
Unrealized loss		(1,627)
Gross unrealized loss	3,259	1,627
Cash equivalents | Available-for-sale securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Estimated Fair Value	466,091	642,095
Short-term investments | Available-for-sale securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Estimated Fair Value	$ 432,301	$ 236,882