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Revenue Recognition - Schedule of Contract Liability Activity (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Change in Contract with Customer, Liability [Abstract]  
Balance at beginning of period $ 9,003
Payments in advance of satisfaction of performance obligations 12,170
Revenue recognized (10,542)
Other, including translation adjustments (2,366)
Balance at end of period $ 12,997