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Revenue (Breakdown of Revenues by Accounting Standards) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenue from contract with customers $ 457,621 $ 282,258 $ 1,568,529 $ 1,066,620
Total revenues 2,998,824 1,885,586 8,829,348 5,556,317
Revenues under ASC 606        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenue from contract with customers 457,621 282,258 1,568,529 1,066,620
Revenues under ASC 815        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues $ 2,541,203 $ 1,603,328 $ 7,260,819 $ 4,489,697