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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Contract revenues	$ 339,676	$ 356,185	$ 685,287	$ 656,314
Income from operations	10,357	3,602	18,764	4,082
T&D [Member]
Segment Reporting Information [Line Items]
Contract revenues	196,925	239,794	413,311	435,528
Income from operations	11,018	8,074	24,559	13,216
C&I [Member]
Segment Reporting Information [Line Items]
Contract revenues	142,751	116,391	271,976	220,786
Income from operations	9,635	4,751	14,971	9,165
General Corporate [Member]
Segment Reporting Information [Line Items]
Income from operations	$ (10,296)	$ (9,223)	$ (20,766)	$ (18,299)

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