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Summary of Significant Accounting Policies (Cash, Cash Equivalents and Restricted Cash) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]        
Cash and cash equivalents $ 307,172 $ 931,751 $ 657,688 $ 328,744
Restricted cash included in deferred expenses and other assets, net 45,034 42,793 20,045 25,883
Total cash, cash equivalents and restricted cash reported in the consolidated statements of cash flows $ 352,206 $ 974,544 $ 677,733 $ 354,627