Acquisition and Plant Consolidation (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011 employees	Sep. 30, 2012 Tenco Acquisition of Tenco Group Inc	Sep. 30, 2012 Tenco Acquisition of Tenco Group Inc	Sep. 30, 2012 Tenco Acquisition of Tenco Group Inc	Oct. 18, 2011 Tenco Acquisition of Tenco Group Inc
Business Acquisition [Line Items]
Cost of acquisition of Tenco Group, Inc, Cash Paid									$ 5,900,000
Net adjustments to the fair value of assets acquired and liabilities assumed								871,000
Revenue generated by Tenco	156,078,000	155,057,000	478,998,000	456,596,000		5,000,000	20,100,000
Net income of Tenco						100,000	400,000
Restructuring Charges					$ 700,000
Number of employees affected by consolidation					77