Revenue Recognition - Schedule of Contract Liability Activity (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Revenue from Contract with Customer [Abstract]
Remaining performance obligation, expected duration (greater than)	1 year
Aggregate transaction price allocated to performance obligations	$ 84,100
Change in Contract with Customer, Liability [Abstract]
Balance at beginning of period	9,003
Payments in advance of satisfaction of performance obligations	5,689
Revenue recognized	(3,842)
Other, including translation adjustments	(1,977)
Balance at end of period	$ 8,873