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	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents	$ 850,230	$ 817,398	$ 623,240
Restricted cash	500,790		438,964
Total cash and cash equivalents inclusive of restricted cash at the end of the period	$ 1,351,020	$ 1,271,915	$ 1,062,204	$ 962,975