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Fair Value Measurements (Details 2) $ in Thousands | 6 Months Ended
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Jun. 30, 2015 USD ($) item | Jun. 30, 2014 USD ($)
Rollforward of contingent consideration liability level three fair value measurements |  |
Change in fair value of contingent consideration liability | $ (4,910) | $ (4,559)
Contingent Consideration Liability |  |
Rollforward of contingent consideration liability level three fair value measurements |  |
Balance at the beginning of the period | 6,922 | 9,233
Change in fair value of contingent consideration liability | 90 | 441
Reduction due to non-attainment of performance target-Ram-Fab | (200) |
Balance at the end of the period | $ 1,812 | 5,403
Additional information |  |
Number of unobservable inputs | item | 2 |
Minimum probability of acquired entity meeting contractual operating performance target (as a percent) | 33.00% |
Maximum probability of acquired entity meeting contractual operating performance target (as a percent) | 100.00% |
Contingent Consideration Liability | Q3 Contracting |  |
Rollforward of contingent consideration liability level three fair value measurements |  |
Payment to Q3C sellers for meeting performance targets | $ (5,000) | (5,000)
Contingent Consideration Liability | Vadnais Corporation |  |
Rollforward of contingent consideration liability level three fair value measurements |  |
Additions to contingent consideration liability |  | $ 729

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