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v3.3.1.900

Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contract revenues: | $ 271,184 | $ 269,861 | $ 276,488 | $ 244,148 | $ 250,979 | $ 248,473 | $ 228,877 | $ 215,638 | $ 1,061,681 | $ 943,967 | $ 902,729
Income from operations: |  |  |  |  |  |  |  |  | 44,841 | 58,404 | 55,617
T&D [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contract revenues: |  |  |  |  |  |  |  |  | 794,898 | 699,595 | 722,387
Income from operations: |  |  |  |  |  |  |  |  | 63,155 | 75,439 | 81,413
C&I [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contract revenues: |  |  |  |  |  |  |  |  | 266,783 | 244,372 | 180,342
Income from operations: |  |  |  |  |  |  |  |  | 13,592 | 16,542 | 10,423
General Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from operations: |  |  |  |  |  |  |  |  | $ (31,906) | $ (33,577) | $ (36,219)

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