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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2016
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
The information in the following table was derived from internal financial reports used for corporate management purposes:
 
 
 
Three months ended
 
 
 
March 31,
 
(In thousands)
 
2016
 
2015
 
 
 
 
 
 
 
Contract revenues:
 
 
 
 
 
 
 
T&D
 
$
182,974
 
$
189,223
 
C&I
 
 
70,660
 
 
54,925
 
 
 
$
253,634
 
$
244,148
 
Income from operations:
 
 
 
 
 
 
 
T&D
 
$
10,669
 
$
16,834
 
C&I
 
 
2,156
 
 
2,836
 
General Corporate
 
 
(9,518)
 
 
(8,073)
 
 
 
$
3,307
 
$
11,597