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Business segment data (Tables)
 3 Months Ended
Mar. 31, 2016
Segment Reporting [Abstract]  
Information on the Company's businesses
Information on the Company's businesses was as follows:
 
Three Months Ended
 
March 31,
 
2016

2015

 
(In thousands)
External operating revenues:
 
 
Regulated operations:
 
 
Electric
$
82,923

$
71,776

Natural gas distribution
299,395

330,573

Pipeline and midstream
3,420

3,940

 
385,738

406,289

Nonregulated operations:
 
 
Pipeline and midstream
8,697

13,000

Construction materials and contracting
209,852

205,658

Construction services
255,500

235,403

Refining
45,066

1,704

Other
300

295

 
519,415

456,060

Total external operating revenues
$
905,153

$
862,349

 
 
 
Intersegment operating revenues:
 

 

Regulated operations:
 
 
Electric
$
—

$
—

Natural gas distribution
—

—

Pipeline and midstream
21,225

21,261

 
21,225

21,261

Nonregulated operations:
 
 
Pipeline and midstream
84

325

Construction materials and contracting
118

948

Construction services
462

11,695

Refining
—

—

Other
1,669

1,772

 
2,333

14,740

Intersegment eliminations
(23,558
)
(36,001
)
Total intersegment operating revenues
$
—

$
—

 
 
 
Earnings (loss) on common stock:
 

 

Regulated operations:
 
 
Electric
$
11,119

$
8,328

Natural gas distribution
25,241

21,450

Pipeline and midstream
5,288

5,357

 
41,648

35,135

Nonregulated operations:
 
 
Pipeline and midstream
1

1,055

Construction materials and contracting
(14,471
)
(14,635
)
Construction services
5,974

4,760

Refining
(7,187
)
(2,394
)
Other
(550
)
(4,413
)
 
(16,233
)
(15,627
)
Intersegment eliminations
118

(991
)
Earnings on common stock before loss from
discontinued operations
25,533

18,517

Loss from discontinued operations, net of tax
(835
)
(324,605
)
Total earnings (loss) on common stock
$
24,698

$
(306,088
)