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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)

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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The net result for the period of deducting operating expenses from operating revenues.

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Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(d))

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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