Restricted Cash and Investments - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Restricted Investments Note [Abstract]
Cash and cash equivalents	$ 327,470	$ 490,592	$ 390,821
Restricted cash included in restricted cash and short-term investments	0		16,000
Total cash, cash equivalents and restricted cash reported in the consolidated statements of cash flows	$ 327,470	$ 490,592	$ 406,821	$ 625,781