Warranty (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Product Warranties Disclosures [Abstract]
Warranty terms, minimum	1 year
Warranty terms, maximum	4 years
Period of time following a sale the majority of claims are paid, min	6 months
Period of time following a sale the majority of claims are paid, max	9 months
Changes in warranty reserves
Beginning balance	$ 10,093	$ 9,686
Additions charged to expense	8,888	8,659
Foreign currency fluctuations	85	(175)
Claims paid	(8,707)	(8,055)
Ending balance	$ 10,359	$ 10,115