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Organization, Business and Basis of Presentation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 item | Jun. 30, 2013
Organization, Business and Basis of Presentation |  |  |  |
Number of business segments |  |  | 2 |
Use of Estimates |  |  |  |
Income from operations | $ 12,395 | $ 15,362 | $ 22,527 | $ 26,752
Net income | 7,741 | 9,462 | 14,013 | 16,422
Income per common share, diluted (in dollars per share) | $ 0.36 | $ 0.44 | $ 0.64 | $ 0.76
Contracts in process | Adjustment |  |  |  |
Use of Estimates |  |  |  |
Gross margin increased as a result of change in estimates pertaining to large transmission projects (as a percent) | 1.90% | 1.30% | 2.20% | 1.00%
Income from operations | 4,300 | 2,700 | 9,700 | 4,000
Net income | $ 2,700 | $ 1,700 | $ 6,100 | $ 2,500
Income per common share, diluted (in dollars per share) | $ 0.13 | $ 0.08 | $ 0.28 | $ 0.12

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