Segment Information (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

The information in the following table is derived from the segment’s internal financial reports used for corporate management purposes:

	Three months ended
	March 31,
(In thousands)	2018		2017
Contract revenues:
T&D	$	216,386	$	195,734
C&I		129,225		104,395
	$	345,611	$	300,129
Income from operations:
T&D	$	13,541	$	5,142
C&I		5,336		4,414
General Corporate		(10,470)		(9,076)
	$	8,407	$	480