Restructuring Activities (Details1) (USD $) In Thousands, unless otherwise specified	3 Months Ended					6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2012	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring plan related to continuing operations
Restructuring reserve, Beginning Balance			$ 400			$ 400	$ 400		$ 400
Accrued and expensed	11	9	7	3	20	16	27	2,940	30	2,943	0
Restructuring reserve, Ending Balance				400					100	400
Continuing Operations [Member]
Restructuring plan related to continuing operations
Restructuring reserve, Beginning Balance			404			404	404	0	404	0
Accrued and expensed										2,909
Charged against accrual									(373)	(2,539)
Adjustments and revisions									30	34
Restructuring reserve, Ending Balance				404					61	404
Facility Consolidation Costs [Member] | Continuing Operations [Member]
Restructuring plan related to continuing operations
Restructuring reserve, Beginning Balance			181			181	181	0	181	0
Accrued and expensed										145
Charged against accrual									(159)	2
Adjustments and revisions									39	34
Restructuring reserve, Ending Balance				181					61	181
Employee Separation Costs [Member] | Continuing Operations [Member]
Restructuring plan related to continuing operations
Restructuring reserve, Beginning Balance			223			223	223	0	223	0
Accrued and expensed										2,244
Charged against accrual									(214)	(2,021)
Adjustments and revisions									(9)	0
Restructuring reserve, Ending Balance				223					0	223
Asset Impairment Costs [Member] | Continuing Operations [Member]
Restructuring plan related to continuing operations
Restructuring reserve, Beginning Balance			0			0	0	0	0	0
Accrued and expensed										520
Charged against accrual									0	(520)
Adjustments and revisions									0	0
Restructuring reserve, Ending Balance				$ 0					$ 0	$ 0