Restricted Cash and Investments - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Restricted Investments Note [Abstract]
Cash and cash equivalents	$ 390,821	$ 595,381	$ 467,353
Restricted cash included in restricted cash and short-term investments	16,000		39,200
Total cash, cash equivalents and restricted cash reported in the consolidated statements of cash flows	$ 406,821	$ 625,781	$ 506,553	$ 581,150