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Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Cash and Cash Equivalents [Abstract]        
Cash $ 2,407,678 $ 1,265,502    
Cash equivalents 1,390,062 1,086,402    
Total cash and cash equivalents 3,797,740 2,351,904    
Restricted cash 4,847 6,388    
Total cash, cash equivalents and restricted cash $ 3,802,587 $ 2,358,292 $ 1,506,367 $ 2,219,323