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Summary of Significant Accounting Policies - Schedule of cash, cash equivalents and restricted cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Accounting Policies [Abstract]        
Cash and cash equivalents $ 98,309 $ 102,711 $ 93,479 $ 91,038
Restricted cash 8,959 46,590 50,621 52,067
Cash, cash equivalents and restricted cash $ 107,268 $ 149,301 $ 144,100 $ 143,105