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Summary of Significant Accounting Policies - Schedule of Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Accounting Policies [Abstract]        
Cash and cash equivalents $ 831,634 $ 97,885 $ 130,791 $ 115,371
Restricted cash included in other assets 4,545 968 646 498
Total cash and cash equivalents and restricted cash $ 836,179 $ 98,853 $ 131,437 $ 115,869