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Revenue from Contracts with Customers 2 (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]        
Contract with Customer, Asset, after Allowance for Credit Loss $ 21,600   $ 12,400  
Deferred Revenue and Credits, Current 126,925 $ 123,526 $ 105,381 $ 107,166
Customer prepayments and deferred revenue 466,617 469,173    
Contract with Customer, Liability, Revenue Recognized (442,904) (450,312)    
Temporary Equity, Foreign Currency Translation Adjustments $ (2,169) $ (2,501)