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Revenue and Related Contract Costs and Contract Liabilities - Summary of Changes in Contract Liabilities (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Revenue From Contract With Customer [Abstract]  
Balance at December 31, 2018 $ 35,600
Cash additions 77,448
Revenue recognized (62,147)
Foreign exchange translation adjustment 87
Balance at June 30, 2019 $ 50,988