XML 48 R38.htm IDEA: XBRL DOCUMENT v3.19.2
Revenue from Contracts with Customers 2 (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]        
Contract with Customer, Asset, after Allowance for Credit Loss $ 22,100   $ 12,400  
Deferred Revenue and Credits, Current 128,704 $ 126,835 $ 105,381 $ 107,166
Customer prepayments and deferred revenue 306,667 282,446    
Contract with Customer, Liability, Revenue Recognized (283,508) (260,280)    
Temporary Equity, Foreign Currency Translation Adjustments $ 164 $ (2,497)