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