Warranty Reserves (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Product Warranty Reserve Activity [Roll Forward]
Balance, beginning of period	$ 12,049	$ 11,683	$ 8,648
Reductions for warranty costs incurred	(13,058)	(11,958)	(8,991)
Warranties issued	13,677	12,302	12,229
Translation and changes in estimates	37	22	(203)
Balance, end of period	$ 12,705	$ 12,049	$ 11,683