Accrued Product Warrenties Accrued Product Warrenties (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Movement in Standard Product Warranty Accrual [Roll Forward]
Accrued product warranties, beginning of period			$ 16,046	$ 18,686	$ 15,322		$ 19,214
Amounts paid for warranty services	(2,465)	(948)	(6,722)	(6,128)
Warranty provisions for products sold	1,689	(388)	4,823	4,639
Currency translation adjustments and other	646	(448)	1,045	233
Accrued product warranties, end of period	15,192	17,430	15,192	17,430	15,322		19,214
Current accrued product warranties, end of period	13,094	14,090	13,094	14,090		13,370
Long-term accrued product warranties, end of period	$ 2,098	$ 3,340	$ 2,098	$ 3,340