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Segment Information (Tables)
 9 Months Ended
Sep. 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
 
Nine months ended
 
 
 
September 30,
 
September 30,
 
(In thousands)
 
2017
 
2016
 
2017
 
2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Contract revenues:
 
 
 
 
 
 
 
 
 
 
 
 
 
T&D
 
$
215,970
 
$
206,441
 
$
651,498
 
$
568,044
 
C&I
 
 
157,532
 
 
76,818
 
 
378,318
 
 
230,783
 
 
 
$
373,502
 
$
283,259
 
$
1,029,816
 
$
798,827
 
Income from operations:
 
 
 
 
 
 
 
 
 
 
 
 
 
T&D
 
$
9,251
 
$
14,550
 
$
22,467
 
$
40,804
 
C&I
 
 
10,503
 
 
5,043
 
 
19,668
 
 
9,633
 
General Corporate
 
 
(8,334)
 
 
(8,454)
 
 
(26,633)
 
 
(26,849)
 
 
 
$
11,420
 
$
11,139
 
$
15,502
 
$
23,588