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Summary of Significant Accounting Policies - Schedule of cash, cash equivalents and restricted cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Accounting Policies [Abstract]        
Cash and cash equivalents $ 528,431 $ 100,005 $ 98,309 $ 102,711
Restricted cash 13,370 14,211 8,959 46,590
Cash, cash equivalents and restricted cash $ 541,801 $ 114,216 $ 107,268 $ 149,301