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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Feb. 25, 2019
Jan. 01, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Reconciliation of Cash, Cash Equivalents, and Restricted Cash            
Cash and cash equivalents $ 315,407     $ 931,751 $ 366,723 $ 657,688
Restricted cash included in deferred expenses and other assets, net 48,407     42,793 20,421 20,045
Total cash, cash equivalents and restricted cash reported in the consolidated statements of cash flows 363,814     $ 974,544 $ 387,144 $ 677,733
New Accounting Pronouncements            
Operating lease right-of-use assets 30,294          
Finance lease right-of-use asset 68,005          
Operating lease liabilities 30,294          
Finance lease liability $ 68,184          
ASU No. 2016-02            
New Accounting Pronouncements            
Operating lease right-of-use assets     $ 31,600      
Finance lease right-of-use asset   $ 68,100        
Operating lease liabilities     $ 31,600      
Finance lease liability   $ 68,100