Accrued Product Warrenties (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Movement in Standard Product Warranty Accrual [Roll Forward]
Accrued product warranties, beginning of period	$ 16,514	$ 16,175
Amounts paid for warranty services	(3,400)	(2,809)
Warranty provisions for products sold	3,995	2,774
Currency translation adjustments and other	118	(300)
Accrued product warranties, end of period	17,227	15,840
Current accrued product warranties, end of period	14,676	13,199	$ 13,406
Long-term accrued product warranties, end of period	$ 2,551	$ 2,641