Restructuring Activities (Details1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended			9 Months Ended	12 Months Ended		3 Months Ended			12 Months Ended		3 Months Ended			12 Months Ended		3 Months Ended			12 Months Ended		3 Months Ended			12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Continuing Operations [Member]	Jun. 30, 2012 Continuing Operations [Member]	Mar. 31, 2012 Continuing Operations [Member]	Sep. 30, 2012 Continuing Operations [Member]	Dec. 31, 2011 Continuing Operations [Member]	Dec. 31, 2010 Continuing Operations [Member]	Sep. 30, 2012 Facility Consolidation Costs [Member]	Jun. 30, 2012 Facility Consolidation Costs [Member]	Mar. 31, 2012 Facility Consolidation Costs [Member]	Dec. 31, 2011 Facility Consolidation Costs [Member]	Dec. 31, 2010 Facility Consolidation Costs [Member]	Sep. 30, 2012 Facility Consolidation Costs [Member] Continuing Operations [Member]	Jun. 30, 2012 Facility Consolidation Costs [Member] Continuing Operations [Member]	Mar. 31, 2012 Facility Consolidation Costs [Member] Continuing Operations [Member]	Dec. 31, 2011 Facility Consolidation Costs [Member] Continuing Operations [Member]	Dec. 31, 2010 Facility Consolidation Costs [Member] Continuing Operations [Member]	Sep. 30, 2012 Employee Severance [Member] Continuing Operations [Member]	Jun. 30, 2012 Employee Severance [Member] Continuing Operations [Member]	Mar. 31, 2012 Employee Severance [Member] Continuing Operations [Member]	Dec. 31, 2011 Employee Severance [Member] Continuing Operations [Member]	Dec. 31, 2010 Employee Severance [Member] Continuing Operations [Member]	Sep. 30, 2012 Asset Impairment Costs [Member] Continuing Operations [Member]	Jun. 30, 2012 Asset Impairment Costs [Member] Continuing Operations [Member]	Mar. 31, 2012 Asset Impairment Costs [Member] Continuing Operations [Member]	Dec. 31, 2011 Asset Impairment Costs [Member] Continuing Operations [Member]	Dec. 31, 2010 Asset Impairment Costs [Member] Continuing Operations [Member]
Restructuring plan related to continuing operations
Restructuring reserve, Beginning Balance			$ 396		$ 113	$ 158	$ 404	$ 404		$ 0	$ 208	$ 287	$ 366		$ 0	$ 103	$ 142	$ 181		$ 0	$ 10	$ 16	$ 223		$ 0	$ 0	$ 0	$ 0		$ 0
Accrued and expensed									2,909						835				145					2,244					520
Charged against accrual	11	20	27	2,940	(47)	(53)	(244)		(2,539)		(73)	(91)	(94)	(447)		(44)	(47)	(46)	2		(3)	(6)	(198)	(2,021)		0	0	0	(520)
Adjustments and revisions					11	8	(2)		34		6	12	15	(125)	103	11	8	7	34		0	0	(9)	0		0	0	0	0
Restructuring reserve, Ending Balance	72		72		77	113	158	77	404	0	141	208	287	366	938	70	103	142	181	0	7	10	16	223	0	0	0	0	0	0
Restructuring reserve liability classification:
Current portion								72
Long-term portion								5
Restructuring reserve	$ 72		$ 72		$ 77	$ 113	$ 158	$ 77	$ 404	$ 0	$ 141	$ 208	$ 287	$ 366	$ 938	$ 70	$ 103	$ 142	$ 181	$ 0	$ 7	$ 10	$ 16	$ 223	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0