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Revenue Recognition Details 1 (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]        
Unbilled Contracts Receivable $ 30,900   $ 22,600  
Deferred Revenue 180,330 $ 144,836 $ 149,106 $ 122,489
Customer pre-payments/deferred revenue 162,765 145,168    
Contract with Customer, Liability, Revenue Recognized (127,985) (120,291)    
Temporary Equity, Foreign Currency Translation Adjustments $ (3,556) $ (2,530)    
Revenue, Remaining Performance Obligation, Optional Exemption, Performance Obligation [true false] true