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Segment Information (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
An allocation of total depreciation, including depreciation of shared construction equipment, and amortization
Depreciation and amortization	$ 29,195	$ 25,156	$ 19,511
T&D
An allocation of total depreciation, including depreciation of shared construction equipment, and amortization
Depreciation and amortization	27,545	23,758	18,426
C&I
An allocation of total depreciation, including depreciation of shared construction equipment, and amortization
Depreciation and amortization	$ 1,650	$ 1,398	$ 1,085

X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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