Restructuring Reserves 2010 Restructuring Plan (Details) (USD $)	3 Months Ended	9 Months Ended		12 Months Ended		23 Months Ended	33 Months Ended		9 Months Ended	12 Months Ended	23 Months Ended	24 Months Ended	9 Months Ended	23 Months Ended	24 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2012 Restructuring Plan 2010 [Member]	Dec. 31, 2011 Restructuring Plan 2010 [Member]	Dec. 31, 2010 Restructuring Plan 2010 [Member]	Dec. 31, 2011 Restructuring Plan 2010 [Member]	Sep. 30, 2012 Restructuring Plan 2010 [Member]	Sep. 30, 2012 Restructuring Plan 2010 [Member] Accrued exit and disposal obiligations [Member]	Sep. 30, 2012 Restructuring Plan 2010 [Member] Employee Severance [Member]	Dec. 31, 2010 Restructuring Plan 2010 [Member] Employee Severance [Member] Employees	Dec. 31, 2011 Restructuring Plan 2010 [Member] Employee Severance [Member]	Dec. 31, 2011 Restructuring Plan 2010 [Member] Employee Severance [Member]	Sep. 30, 2012 Restructuring Plan 2010 [Member] Facility Closing [Member]	Dec. 31, 2011 Restructuring Plan 2010 [Member] Facility Closing [Member]	Dec. 31, 2011 Restructuring Plan 2010 [Member] Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve			$ 2,598,000			$ 19,478,000			$ 7,000		$ 14,098,000		$ 2,591,000	$ 5,380,000
Adjustments to reserves			(162,000)			1,615,000			1,000		826,000		(163,000)	789,000
Cash charges			(263,000)			(17,642,000)			(8,000)		(14,990,000)		(255,000)	(2,652,000)
Non - cash settlements			(416,000)			(996,000)			0		0		(416,000)	(996,000)
Impact of changes in exchange rates			(11,000)			143,000			0		73,000		(11,000)	70,000
Restructuring reserve			1,746,000	2,598,000		2,598,000	1,746,000		0		7,000	7,000	1,746,000	2,591,000	2,591,000
Restructuring charges	(163,000)	2,280,000		1,600,000	19,500,000							14,900,000			6,000,000
Number of positions eliminated										200
Restructuring charges that have been paid							17,900,000
Restructuring reserve included in accrued expenses and other current liabilities			1,200,000				1,200,000
Restructuring reserve included in accrued exit and disposal obligations								$ 300,000