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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
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]        
Cash and cash equivalents $ 542,174 $ 438,961 $ 573,383  
Restricted cash 420,801 338,635 250,705  
Total cash and cash equivalents inclusive of restricted cash at the end of the period $ 962,975 $ 777,596 $ 824,088 $ 781,283