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Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Cash and Cash Equivalents [Abstract]        
Cash $ 2,437,127 $ 2,501,452    
Cash equivalents 365,589 980,580    
Total cash and cash equivalents 2,802,716 3,482,032    
Restricted cash 6,369 4,352    
Total cash, cash equivalents and restricted cash $ 2,809,085 $ 3,486,384 $ 3,802,587 $ 2,358,292