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, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents	$ 623,240	$ 542,174	$ 432,548	$ 438,961
Restricted cash	438,964	420,801	382,233	338,635
Total cash and cash equivalents inclusive of restricted cash at the end of the period	$ 1,062,204	$ 962,975	$ 814,781	$ 777,596