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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 item | Jun. 30, 2012
Segment Information |  |  |  |
Number of reporting segments |  |  | 2 |
Segment contract revenues and operating income (loss) |  |  |  |
Contract revenues | $ 213,916 | $ 260,410 | $ 415,258 | $ 500,638
Operating income (loss) | 15,362 | 15,657 | 26,752 | 25,885
T&D |  |  |  |
Segment contract revenues and operating income (loss) |  |  |  |
Contract revenues | 174,041 | 215,816 | 334,573 | 420,814
Operating income (loss) | 21,746 | 20,911 | 38,440 | 37,723
C&I |  |  |  |
Segment contract revenues and operating income (loss) |  |  |  |
Contract revenues | 39,875 | 44,594 | 80,685 | 79,824
Operating income (loss) | 1,429 | 1,860 | 4,155 | 2,959
General Corporate |  |  |  |
Segment contract revenues and operating income (loss) |  |  |  |
Operating income (loss) | $ (7,813) | $ (7,114) | $ (15,843) | $ (14,797)

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