Warranty (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 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	5,946	5,670
Foreign currency fluctuations	48	(118)
Claims paid	(5,766)	(5,209)
Ending balance	$ 10,321	$ 10,029