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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 item	Jun. 30, 2013
Segment Information
Number of reporting segments			2
Segment contract revenues and operating income (loss)
Contract revenues	$ 228,877	$ 213,916	$ 444,515	$ 415,258
Operating income (loss)	12,395	15,362	22,527	26,752
General Corporate
Segment contract revenues and operating income (loss)
Operating income (loss)	(8,742)	(7,813)	(15,939)	(15,843)
T&D
Segment contract revenues and operating income (loss)
Contract revenues	166,381	174,041	328,425	334,573
T&D | Operating segment
Segment contract revenues and operating income (loss)
Operating income (loss)	16,782	21,746	30,744	38,440
C&I
Segment contract revenues and operating income (loss)
Contract revenues	62,496	39,875	116,090	80,685
C&I | Operating segment
Segment contract revenues and operating income (loss)
Operating income (loss)	$ 4,355	$ 1,429	$ 7,722	$ 4,155

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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- Definition

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=26872669&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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