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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2016
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:
 
 
For the Year Ended December 31,
(in thousands)
 
2016
 
2015
 
2014
Contract revenues:
 
 
  
 
 
 
  
 
 
 
  
 
T&D
 
$
818,972
 
 
$
794,898
 
 
$
699,595
 
C&I
 
 
323,515
 
 
 
266,783
 
 
 
244,372
 
  
 
$
1,142,487
 
 
$
1,061,681
 
 
$
943,967
 
Income from operations:
 
 
  
 
 
 
  
 
 
 
  
 
T&D
 
$
63,459
 
 
$
63,155
 
 
$
75,439
 
C&I
 
 
13,920
 
 
 
13,592
 
 
 
16,542
 
General Corporate
 
 
(38,625
) 
 
 
(31,906
) 
 
 
(33,577
) 
  
 
$
38,754
 
 
$
44,841
 
 
$
58,404
 
Reconciliation of Assets from Segment to Consolidated [Table Text Block]
Identifiable assets, consisting of contract receivables, costs and estimated earnings in excess of billings on uncompleted contracts, construction materials inventory, goodwill and intangibles for each segment are as follows as of December 31:
 
(in thousands)
 
2016
 
2015
T&D
 
$
235,548
 
 
$
204,309
 
C&I
 
 
125,696
 
 
 
92,939
 
Other
 
 
212,251
 
 
 
227,677
 
  
 
$
573,495
 
 
$
524,925
 
Schedule Of Segment Reporting Information Related To Allocation Of Depreciation And Amortization By Segment [Table Text Block]
An allocation of total depreciation, including depreciation of shared construction equipment, and amortization to each segment is as follows:
 
 
For the Year Ended December 31,
(in thousands)
 
2016
 
2015
 
2014
Depreciation and amortization
 
 
  
 
 
 
  
 
 
 
  
 
T&D
 
$
35,947
 
 
$
35,456
 
 
$
30,957
 
C&I
 
 
3,175
 
 
 
2,573
 
 
 
2,466
 
  
 
$
39,122
 
 
$
38,029
 
 
$
33,423