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Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 171,209 $ 30,284 $ 110,138 $ 46,156
Restricted cash 126,801 144,930 156,026 136,667
Total cash, cash equivalents and restricted cash $ 298,010 $ 175,214 $ 266,164 $ 182,823