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Revenue and Related Contract Costs and Contract Liabilities - Summary of Changes in Contract Liabilities (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Revenue From Contract With Customer [Abstract]  
Balance at January 1, 2018 $ 31,981
Cash additions 147,231
Revenue recognized (120,477)
Foreign exchange translation adjustment (475)
Balance at September 30, 2018 $ 58,260