Accrued Product Warrenties Accrued Product Warrenties (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Movement in Standard Product Warranty Accrual [Roll Forward]
Accrued product warranties, beginning of period	$ 15,994	$ 18,960	$ 16,046	$ 18,686
Amounts paid for warranty services	(2,090)	(2,193)	(4,257)	(5,181)
Warranty provisions for products sold	1,299	2,319	3,134	5,027
Currency translation adjustments and other	119	128	399	682
Accrued product warranties, end of period	15,322	19,214	15,322	19,214
Current accrued product warranties, end of period	13,232	15,941	13,232	15,941	13,370
Long-term accrued product warranties, end of period	$ 2,090	$ 3,273	$ 2,090	$ 3,273