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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 item | Sep. 30, 2012
Segment Information |  |  |  |
Number of reporting segments |  |  | 2 |
Segment contract revenues and operating income (loss) |  |  |  |
Contract revenues | $ 232,890 | $ 250,558 | $ 648,148 | $ 751,196
Operating income (loss) | 13,079 | 14,236 | 39,831 | 40,121
T&D |  |  |  |
Segment contract revenues and operating income (loss) |  |  |  |
Contract revenues | 187,156 | 204,264 | 521,729 | 625,078
Operating income (loss) | 22,757 | 20,174 | 61,197 | 57,897
C&I |  |  |  |
Segment contract revenues and operating income (loss) |  |  |  |
Contract revenues | 45,734 | 46,294 | 126,419 | 126,118
Operating income (loss) | 2,387 | 2,367 | 6,542 | 5,326
General Corporate |  |  |  |
Segment contract revenues and operating income (loss) |  |  |  |
Operating income (loss) | $ (12,065) | $ (8,305) | $ (27,908) | $ (23,102)

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