Product Warranty (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Activity for accrued warranty expense
Balance at beginning of period	$ 3,526	$ 3,345
Provision	1,086	1,271
Claims paid/costs incurred	(901)	(1,030)
Foreign currency translation	53	9
Balance at end of period	$ 3,764	$ 3,595
Maximum
Product Warranty Liability [Line Items]
Product Warranty	2 years
Minimum
Product Warranty Liability [Line Items]
Product Warranty	1 year