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Revenue from Contracts with Customers (Details 2) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]    
Contract with Customer, Asset, Net $ 19,400  
Deferred Revenue and Credits, Current 123,526 $ 107,166
Customer prepayments and deferred revenue 469,173  
Contract with Customer, Liability, Revenue Recognized (450,312)  
Temporary Equity, Foreign Currency Translation Adjustments $ (2,501)