Other Current Liabilities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other Current Liabilities [Abstract]
Taxes, other than income taxes	$ 5,629	$ 5,654
Warranty	8,759	7,043
Deferred revenue	3,159	2,740
Rebates	5,185	4,927
Freight	3,945	4,257
Restructuring	835	1,798
Miscellaneous accrued expenses	8,974	11,401
Other	2,918	2,882
Total	39,404	40,702
Changes in warranty reserves [Roll Forward]
Beginning balance	7,043	5,985	6,018
Product warranty provision	12,815	10,506	8,092
Acquired reserves	10	0	17
Foreign currency	(63)	(88)	133
Claims paid	(11,046)	(9,360)	(8,275)
Ending balance	$ 8,759	$ 7,043	$ 5,985