Warranty (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
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	$ 9,663	$ 9,357
Additions charged to expense	7,789	8,239
Foreign currency fluctuations	(123)	(50)
Claims paid	(7,799)	(7,704)
Ending balance	$ 9,530	$ 9,842