Acquisition (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		0 Months Ended
	Mar. 31, 2013 Contingent consideration	Feb. 22, 2013 Endeka	Feb. 22, 2013 Endeka Existing customer contracts and relationships	Feb. 22, 2013 Endeka Technology	Feb. 22, 2013 Endeka Trademark and tradename	Feb. 22, 2013 Endeka Non-compete agreement	Feb. 22, 2013 Endeka Other intangibles	Feb. 22, 2013 Endeka Identifiable intangible assets Minimum	Feb. 22, 2013 Endeka Identifiable intangible assets Maximum	Feb. 22, 2013 Endeka Contingent consideration item
Acquisition
Number of components of contingent consideration										2
Discount rate (as a percent)	50.50%							40.00%	50.00%	50.50%
Royalty rates (as a percent)								0.50%	1.50%
Estimated Fair Value
Cash paid		$ 4,894
Holdback consideration		400
Contingent consideration		1,329
Total consideration		6,623
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash		20
Other current assets		44
Property, plant and equipment		4,617
Other assets		12
Trade accounts payable		(992)
Other current liabilities		(186)
Notes payable and financed liabilities		(6,476)
Deferred tax liabilities		(3,062)
Net tangible liabilities acquired		(6,023)
Intangibles			4,770	930	300	250	95
Goodwill		6,301
Total purchase price		$ 6,623
Estimated Useful Life			10 years	6 years	10 years	2 years	10 years