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Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 315,808 $ 37,575 $ 171,209 $ 30,284
Restricted cash 126,219 126,544 126,801 144,930
Total cash, cash equivalents and restricted cash $ 442,027 $ 164,119 $ 298,010 $ 175,214