Accrued Product Warranties (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Movement in Standard Product Warranty Accrual [Roll Forward]
Accrued product warranties, beginning of year	$ 18,686	$ 9,438	$ 7,826
Amounts paid for warranty services	(7,732)	(2,029)	(8,861)
Warranty provisions for products sold	5,402	2,073	10,038
Business acquisitions and disposals	(20)	8,969	202
Currency translation adjustments and other	(290)	235	233
Accrued product warranties, end of year	16,046	18,686	9,438
Current accrued product warranties, end of year	13,370	15,711	9,438
Long-term accrued product warranties, end of ear	$ 2,676	$ 2,975	$ 0
Minimum [Member]
Schedule of Accrued Liabilities [Line Items]
Product warranty term	12
Maximum [Member]
Schedule of Accrued Liabilities [Line Items]
Product warranty term	24