Segment Information (Tables)

6 Months Ended

Jun. 30, 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						Six months ended
	June 30,						June 30,
(In thousands)	2018			2017			2018			2017
Contract revenues:
T&D	$	196,925		$	239,794		$	413,311		$	435,528
C&I		142,751			116,391			271,976			220,786
	$	339,676		$	356,185		$	685,287		$	656,314
Income from operations:
T&D	$	11,018		$	8,074		$	24,559		$	13,216
C&I		9,635			4,751			14,971			9,165
General Corporate		(10,296	)		(9,223	)		(20,766	)		(18,299	)
	$	10,357		$	3,602		$	18,764		$	4,082