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Segment Information (Tables)
 3 Months Ended
Mar. 31, 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
 
 
 
March 31,
 
(In thousands)
 
2017
 
2016
 
 
 
 
 
 
 
Contract revenues:
 
 
 
 
 
T&D
 
$
195,734
 
$
182,974
 
C&I
 
 
104,395
 
 
70,660
 
 
 
$
300,129
 
$
253,634
 
Income from operations:
 
 
 
 
 
 
 
T&D
 
$
5,142
 
$
10,669
 
C&I
 
 
4,414
 
 
2,156
 
General Corporate
 
 
(9,076)
 
 
(9,518)
 
 
 
$
480
 
$
3,307