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Cash, Cash Equivalents, and Restricted Cash - Reconciliation to Statements of Cash Flows (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 297,060 $ 92,258    
Restricted cash 218,735 193,987    
Total cash, cash equivalents, and restricted cash shown in the condensed consolidated statements of cash flows $ 515,795 $ 286,245 $ 351,418 $ 359,991