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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Income from operations	$ 14,137	$ 11,420	$ 32,901	$ 15,502
Service [Member]
Segment Reporting Information [Line Items]
Contract revenues	399,537	373,502	1,084,824	1,029,816
T&D [Member]
Segment Reporting Information [Line Items]
Income from operations	13,935	9,251	38,494	22,467
T&D [Member] | Service [Member]
Segment Reporting Information [Line Items]
Contract revenues	222,531	215,970	635,842	651,498
C&I [Member]
Segment Reporting Information [Line Items]
Income from operations	10,227	10,503	25,198	19,668
C&I [Member] | Service [Member]
Segment Reporting Information [Line Items]
Contract revenues	177,006	157,532	448,982	378,318
General Corporate [Member]
Segment Reporting Information [Line Items]
Income from operations	$ (10,025)	$ (8,334)	$ (30,791)	$ (26,633)

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-Name Accounting Standards Codification
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