Accrued Product Warranties Accrued Product Warrenties (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]
Accrued product warranties, beginning of period			$ 17,732	$ 16,152	$ 15,989		$ 16,791
Amounts paid for warranty services	(2,368)	(1,128)	(7,131)	(5,273)
Warranty provisions for products sold	2,254	768	5,546	5,309
Currency translation adjustments and other	(343)	160	(615)	403
Accrued product warranties, end of period	15,532	16,591	15,532	16,591	15,989		16,791
Current accrued product warranties, end of period	12,881	13,464	12,881	13,464		14,665
Long-term accrued product warranties, end of period	$ 2,651	$ 3,127	$ 2,651	$ 3,127