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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
New Accounting Pronouncements            
Operating lease right-of-use assets $ 27,816          
Finance lease right-of-use asset 145,528          
Lease liabilities 27,830          
Finance lease liability 147,064          
Reconciliation of Cash, Cash Equivalents, and Restricted Cash            
Cash and cash equivalents 917,309     $ 931,751 $ 757,384 $ 657,688
Restricted cash included in deferred expenses and other assets, net 61,509     42,793 34,974 20,045
Total cash, cash equivalents and restricted cash reported in the consolidated statements of cash flows 978,818     $ 974,544 $ 792,358 $ 677,733
ASU No. 2016-02            
New Accounting Pronouncements            
Operating lease right-of-use assets     $ 31,600      
Finance lease right-of-use asset $ 145,500          
Lease liabilities     $ 31,600      
Finance lease liability   $ 147,100