Management Actions (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Dec. 31, 2010
Severance, Early Retirement and Related Costs - 2010 Action [Member]
Reconciliation of restructuring liability [Roll Forward]
Balance, beginning of period	$ 106	$ 1,584
Restructuring action			1,671
Cash payments	(64)	(1,534)	(87)
Foreign currency adjustments	(4)	(54)
Change in estimate		110
Balance, end of period	38	106	1,584
Severence and Related Costs - 2012 Action [Member]
Reconciliation of restructuring liability [Roll Forward]
Restructuring action	760
Cash payments	(138)
Foreign currency adjustments	17
Balance, end of period	$ 639