Significant Accounting Policies Accrued Warranty (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accrued Warranty [Abstract]
Product Warranty Accrual, beginning balance	$ 29,863	$ 28,183	$ 28,820
Product Warranty Accrual, Payments	(14,102)	(17,884)	(11,877)
Product Warranty Accrual, provisions for warranties and field recalls	10,249	19,786	12,435
Product Warranty Accrual, currency impact	41	(222)	(1,195)
Product Warranty Accrual, ending balance	$ 26,051	$ 29,863	$ 28,183