Warranty (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
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	$ 9,686	$ 9,663
Additions charged to expense	8,659	7,789
Foreign currency fluctuations	(175)	(123)
Claims paid	(8,055)	(7,799)
Ending balance	$ 10,115	$ 9,530