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Business segment data (Tables)
 6 Months Ended
Jun. 30, 2016
Segment Reporting [Abstract]  
Information on the Company's businesses
Information on the Company's businesses was as follows:
 
Three Months Ended
Six Months Ended
 
June 30,
June 30,
 
2016

2015

2016

2015

 
(In thousands)
External operating revenues:
 
 
 
 
Regulated operations:
 
 
 
 
Electric
$
73,832

$
64,265

$
156,755

$
136,041

Natural gas distribution
112,770

132,965

412,165

463,538

Pipeline and midstream
19,450

18,448

22,998

22,588

 
206,052

215,678

591,918

622,167

Nonregulated operations:
 
 
 
 
Pipeline and midstream
10,268

14,749

18,966

27,749

Construction materials and contracting
541,257

495,640

751,108

701,298

Construction services
285,924

211,515

541,424

446,918

Other
447

457

747

752

 
837,896

722,361

1,312,245

1,176,717

Total external operating revenues
$
1,043,948

$
938,039

$
1,904,163

$
1,798,884

 
 
 
 
 
 
Three Months Ended
Six Months Ended
 
June 30,
June 30,
 
2016

2015

2016

2015

 
(In thousands)
Intersegment operating revenues:
 

 

 

 

Regulated operations:
 
 
 
 
Electric
$
—

$
—

$
—

$
—

Natural gas distribution
—

—

—

—

Pipeline and midstream
6,594

6,564

27,691

27,625

 
6,594

6,564

27,691

27,625

Nonregulated operations:
 
 
 
 
Pipeline and midstream
36

110

119

316

Construction materials and contracting
97

1,257

215

2,205

Construction services
77

3,491

539

15,186

Other
1,669

1,792

3,338

3,563

 
1,879

6,650

4,211

21,270

Intersegment eliminations
(8,473
)
(13,214
)
(31,902
)
(48,895
)
Total intersegment operating revenues
$
—

$
—

$
—

$
—

 
 
 
 
 
Earnings (loss) on common stock:
 

 

 

 

Regulated operations:
 
 
 
 
Electric
$
8,022

$
5,910

$
19,141

$
14,237

Natural gas distribution
(7,777
)
(5,375
)
17,464

16,075

Pipeline and midstream
5,564

4,328

10,852

9,685

 
5,809

4,863

47,457

39,997

Nonregulated operations:
 
 
 
 
Pipeline and midstream
737

(966
)
739

89

Construction materials and contracting
33,696

20,136

19,225

5,501

Construction services
6,990

7,003

12,964

11,763

Other
(1,105
)
(4,404
)
(2,564
)
(9,358
)
 
40,318

21,769

30,364

7,995

Intersegment eliminations
—

(742
)
—

(1,733
)
Earnings on common stock before loss from
discontinued operations
46,127

25,890

77,821

46,259

Loss from discontinued operations, net of tax
(276,102
)
(263,419
)
(294,138
)
(593,404
)
Loss from discontinued operations attributable to noncontrolling interest
(120,651
)
(7,754
)
(131,691
)
(11,282
)
Total loss on common stock
$
(109,324
)
$
(229,775
)
$
(84,626
)
$
(535,863
)