Warranty (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 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	2,488	2,413
Foreign currency fluctuations	60	(167)
Claims paid	(2,766)	(2,498)
Ending balance	$ 9,875	$ 9,434