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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, 2019
USD ($)
Revenue From Contract With Customer [Abstract]  
Balance at December 31, 2018 $ 35,600
Cash additions 150,566
Revenue recognized (123,330)
Foreign exchange translation adjustment (451)
Balance at September 30, 2019 $ 62,385