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Business Acquisitions Pro Forma Data (Details) (Cleveland Roll Forming Environmental Division, Inc. d/b/a PECO [Member], USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Cleveland Roll Forming Environmental Division, Inc. d/b/a PECO [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue | $ 21,906 | $ 31,181 | $ 44,548 | $ 57,099
Net income / (loss) | $ (295) | $ 1,044 | $ (525) | $ 1,468
Basic (in dollars per share) | $ (0.01) | $ 0.05 | $ (0.02) | $ 0.07
Diluted (in dollars per share) | $ (0.01) | $ 0.04 | $ (0.02) | $ 0.06

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