Quarterly Financial Information (Unaudited) (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended			0 Months Ended		3 Months Ended	9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 29, 2012 Acquisition of Tenco Group Inc	Oct. 20, 2011 Acquisition of Tenco Group Inc	Dec. 31, 2011 Acquisition of Tenco Group Inc	Oct. 17, 2011 Acquisition of Tenco Group Inc
Effect of Fourth Quarter Events [Line Items]
Goodwill impairment	$ 656,000	$ 1,900,000	$ 656,000	$ 1,898,000	$ 0
Gain on Bargain purchase			0	8,616,000	0	8,616,000	7,745,000	8,600,000	7,745,000
Restructuring cost		900,000
Charge relating to various litigation matters	2,400,000
Reversal of environmental reserve	$ 1,200,000