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Revenue from Contracts with Customers Details 2 - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]    
Contract with Customer, Asset, Net $ 16,700  
Deferred Revenue and Credits, Current 126,835 $ 107,166
Customer prepayments and deferred revenue 282,446  
Contract with Customer, Liability, Revenue Recognized (260,280)  
Temporary Equity, Foreign Currency Translation Adjustments $ (2,497)