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Segment Information (Tables)
9 Months Ended
Sep. 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
 
 
Nine months ended
 
 
 
September 30,
 
 
September 30,
 
(In thousands)
 
2018
 
 
2017
 
 
2018
 
 
2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Contract revenues:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
T&D
 
$
222,531
 
 
$
215,970
 
 
$
635,842
 
 
$
651,498
 
C&I
 
 
177,006
 
 
 
157,532
 
 
 
448,982
 
 
 
378,318
 
 
 
$
399,537
 
 
$
373,502
 
 
$
1,084,824
 
 
$
1,029,816
 
Income from operations:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
T&D
 
$
13,935
 
 
$
9,251
 
 
$
38,494
 
 
$
22,467
 
C&I
 
 
10,227
 
 
 
10,503
 
 
 
25,198
 
 
 
19,668
 
General Corporate
 
 
(10,025
)
 
 
(8,334
)
 
 
(30,791
)
 
 
(26,633
)
 
 
$
14,137
 
 
$
11,420
 
 
$
32,901
 
 
$
15,502