Warranty Reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Product Warranty Reserve Activity [Roll Forward]
Balance, beginning of period	$ 13,005	$ 12,705	$ 12,049
Reductions for warranty costs incurred	(15,081)	(14,051)	(13,058)
Warranties issued	16,537	14,846	13,677
Translation and changes in estimates	(354)	(495)	37
Balance, end of period	$ 14,107	$ 13,005	$ 12,705