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Revenue from Contracts with Customers 2 (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]          
Deferred Revenue $ 195,234   $ 149,106 $ 150,476 $ 122,489
Contract with Customer, Asset, after Allowance for Credit Loss 37,300   $ 22,600    
Customer prepayments and deferred revenue 496,437 $ 435,952      
Contract with Customer, Liability, Revenue Recognized (446,775) (409,391)      
Temporary Equity, Foreign Currency Translation Adjustments $ (3,534) $ 1,426