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Revenue Recognition Details 1 (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]        
Unbilled Contracts Receivable $ 22,300   $ 17,400  
Deferred Revenue 144,836 $ 128,962 $ 122,489 $ 105,381
Customer pre-payments/deferred revenue 145,168 167,599    
Contract with Customer, Liability, Revenue Recognized (120,291) (144,303)    
Temporary Equity, Foreign Currency Translation Adjustments $ (2,530) $ 285    
Revenue, Remaining Performance Obligation, Optional Exemption, Performance Obligation [true false] true