Restricted Cash and Investments - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Restricted Investments Note [Abstract]
Cash and cash equivalents	$ 572,828	$ 579,350	$ 452,943
Restricted cash included in restricted cash and short-term investments	67,600		3,400
Total cash, cash equivalents and restricted cash reported in the consolidated statements of cash flows	$ 640,428	$ 581,150	$ 456,343	$ 405,511