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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net	$ 356,185	$ 261,934	$ 656,314	$ 515,568
Income from operations:	3,602	9,142	4,082	12,449
T&D [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net	239,794	178,629	435,528	361,603
Income from operations:	8,074	15,585	13,216	26,254
C&I [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Services, Net	116,391	83,305	220,786	153,965
Income from operations:	4,751	2,434	9,165	4,590
General Corporate [Member]
Segment Reporting Information [Line Items]
Income from operations:	$ (9,223)	$ (8,877)	$ (18,299)	$ (18,395)

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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=63488584&loc=d3e20235-122688

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