Warranty (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 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	5,127	5,578
Foreign currency fluctuations	33	(132)
Claims paid	(4,916)	(5,055)
Ending balance	$ 9,907	$ 9,748