Investments and Fair Value Measurements - Unrealized Losses Positions (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Fair Value
Less Than 12 Months, Fair Value	$ 2,362	$ 31,662
12 Months of Greater, Fair Value	10,001	74,452
Fair Value	12,363	106,114
Gross Unrealized Loss
Less than 12 months, Gross Unrealized Losses	(5)	(116)
Greater than 12 months, Gross Unrealized Losses	(4)	(971)
Gross Unrealized Loss	(9)	(1,087)
Restricted Investments
Fair Value
Less Than 12 Months, Fair Value	17,221
12 Months of Greater, Fair Value	0
Fair Value	17,221
Gross Unrealized Loss
Less than 12 months, Gross Unrealized Losses	(5)
Greater than 12 months, Gross Unrealized Losses	0
Gross Unrealized Loss	(5)
Commercial paper
Fair Value
Less Than 12 Months, Fair Value		20,020
12 Months of Greater, Fair Value		0
Fair Value		20,020
Gross Unrealized Loss
Less than 12 months, Gross Unrealized Losses		(73)
Greater than 12 months, Gross Unrealized Losses		0
Gross Unrealized Loss		(73)
Commercial paper \| Restricted Investments
Fair Value
Less Than 12 Months, Fair Value	5,432
12 Months of Greater, Fair Value	0
Fair Value	5,432
Gross Unrealized Loss
Less than 12 months, Gross Unrealized Losses	(3)
Greater than 12 months, Gross Unrealized Losses	0
Gross Unrealized Loss	(3)
Corporate notes/bonds
Fair Value
Less Than 12 Months, Fair Value	2,362	9,661
12 Months of Greater, Fair Value	10,001	74,452
Fair Value	12,363	84,113
Gross Unrealized Loss
Less than 12 months, Gross Unrealized Losses	(5)	(27)
Greater than 12 months, Gross Unrealized Losses	(4)	(971)
Gross Unrealized Loss	(9)	(998)
U.S. treasuries
Fair Value
Less Than 12 Months, Fair Value		1,981
12 Months of Greater, Fair Value		0
Fair Value		1,981
Gross Unrealized Loss
Less than 12 months, Gross Unrealized Losses		(16)
Greater than 12 months, Gross Unrealized Losses		0
Gross Unrealized Loss		$ (16)
U.S. treasuries \| Restricted Investments
Fair Value
Less Than 12 Months, Fair Value	11,789
12 Months of Greater, Fair Value	0
Fair Value	11,789
Gross Unrealized Loss
Less than 12 months, Gross Unrealized Losses	(2)
Greater than 12 months, Gross Unrealized Losses	0
Gross Unrealized Loss	$ (2)

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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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