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Business segment data (Tables)
3 Months Ended
Mar. 31, 2015
Segment Reporting [Abstract]  
Information on the Company's businesses
Information on the Company's businesses was as follows:
Three Months Ended March 31, 2015
External
Operating
Revenues
Inter-
segment
Operating
Revenues
Earnings (Loss)
on Common
Stock
 
(In thousands)
Electric
$
71,776

$

$
8,328

Natural gas distribution
330,573


21,450

Pipeline and energy services
25,095

21,341

4,018

 
427,444

21,341

33,796

Exploration and production
49,710

5,226

(328,904
)
Construction materials and contracting
205,658

948

(14,635
)
Construction services
235,403

11,695

4,760

Other
295

1,772

(255
)
 
491,066

19,641

(339,034
)
Intersegment eliminations

(40,982
)
(850
)
Total
$
918,510

$

$
(306,088
)


Three Months Ended March 31, 2014
External
Operating
Revenues
Inter-
segment
Operating
Revenues
Earnings (Loss)
on Common
Stock
 
(In thousands)
Electric
$
73,647

$

$
11,033

Natural gas distribution
374,233


27,263

Pipeline and energy services
43,661

18,276

4,349

 
491,541

18,276

42,645

Exploration and production
116,669

20,867

20,939

Construction materials and contracting
164,423

4,017

(23,574
)
Construction services
269,892

3,738

16,568

Other
328

1,724

264

 
551,312

30,346

14,197

Intersegment eliminations

(48,622
)
(351
)
Total
$
1,042,853

$

$
56,491