Restricted Cash and Investments - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Restricted Investments Note [Abstract]
Cash and cash equivalents	$ 313,824	$ 490,592	$ 459,368
Restricted cash included in restricted cash and short-term investments	0		5,600
Total cash, cash equivalents and restricted cash reported in the consolidated statements of cash flows	$ 313,824	$ 490,592	$ 464,968	$ 625,781