Accrued Product Warranties Accrued Product Warrenties (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]
Accrued product warranties, beginning of period	$ 17,732	$ 16,152
Amounts paid for warranty services	(2,687)	(2,392)
Warranty provisions for products sold	1,970	2,706
Currency translation adjustments and other	(303)	186
Accrued product warranties, end of period	16,712	16,652
Current accrued product warranties, end of period	13,751	13,557	14,665
Long-term accrued product warranties, end of period	$ 2,961	$ 3,095