Business Acquisitions - Table (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011 TQM [Member]	Dec. 31, 2011 GW Smith [Member]	Dec. 31, 2010 Summit [Member]	Sep. 30, 2012 NP Coil Dexter [Member]
Business Acquisition [Line Items]
Current assets	$ 8,946	$ 6,138		$ 5,536
Fixed assets	4,308	2,869		1,211
Intangibles	3,556	6,260	17,100	3,825
Goodwill	6,773	1,120	3,423	2,180
Other long-term assets	1,355	1		389
Business Acquisition, Purchase Price Allocation, Assets Acquired	24,938	16,388		13,141
Short-term Debt				(44)
Other current liabilities	(2,224)	(1,001)		(7,310)
Long-term debt				(854)
Other Non-current liabilities	(6,869)	0		(1,258)
Present value of hold-back	(1,754)	(869)		(927)
Business Acquisition, Purchase Price Allocation, Liabilities Assumed	(10,847)	(1,870)		(10,393)
Business Acquisition Purchase Price Allocation Additional Minimum Pension Liability	987	0
Business Acquisition Purchase Price Allocation Equity Acquired	987	0
Fair Value of Previously Held Equity Interest	(4,578)	0
Business Acquisition, Cost of Acquired Entity, Purchase Price	$ 10,500	$ 14,518	$ 29,116	$ 2,748