Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Schedule of Reconciliation of Cash and Cash Equivalents Inclusive of Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents	$ 943,969	$ 817,398	$ 1,070,190
Restricted cash	481,922		431,651
Total cash and cash equivalents inclusive of restricted cash at the end of the period	$ 1,425,891	$ 1,271,915	$ 1,501,841	$ 962,975