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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net	$ 300,129	$ 253,634
Income from operations:	480	3,307
T&D [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net	195,734	182,974
Income from operations:	5,142	10,669
C&I [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net	104,395	70,660
Income from operations:	4,414	2,156
General Corporate [Member]
Segment Reporting Information [Line Items]
Income from operations:	$ (9,076)	$ (9,518)

X

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

+ References

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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=63488584&loc=d3e20235-122688

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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