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Revenue Recognition - Schedule of Contract Liability Activity (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Change in Contract with Customer, Liability [Abstract]  
Balance as of December 31, 2018 $ 12,997
Payments in advance of satisfaction of performance obligations 6,932
Revenue recognized (6,771)
Other, including translation adjustments (3,285)
Balance as of June 30, 2019 $ 9,873