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Industry Segment Information
 12 Months Ended
Dec. 31, 2011
Segment Reporting [Abstract]  
Segment Information
INDUSTRY SEGMENT INFORMATION
 

The Company is principally engaged in two business segments: the acquisition, development, exploration and production of oil and gas in the continental United States (oil and gas operations) and the purchase, distribution and sale of natural gas in central and north Alabama (natural gas distribution). The accounting policies of the segments are the same as those described in Note 1, Summary of Significant Accounting Policies.
Years ended December 31,(in thousands)
2011
2010
2009
Operating revenues
 
 
 
Oil and gas operations
$
948,526

$
958,762

$
822,546

Natural gas distribution
534,953

619,772

617,874

Total
$
1,483,479

$
1,578,534

$
1,440,420

Operating income (loss)
 
 
 
Oil and gas operations
$
363,131

$
406,729

$
353,645

Natural gas distribution
86,216

88,383

83,984

Eliminations and corporate expenses
(1,078
)
(1,735
)
(2,236
)
Total
$
448,269

$
493,377

$
435,393

Depreciation, depletion and amortization expense
 
 
 
Oil and gas operations
$
244,081

$
203,823

$
184,089

Natural gas distribution
39,916

44,042

50,995

Total
$
283,997

$
247,865

$
235,084

Interest expense
 
 
 
Oil and gas operations
$
30,907

$
25,753

$
25,775

Natural gas distribution
14,740

13,894

13,714

Eliminations and other
(825
)
(425
)
(110
)
Total
$
44,822

$
39,222

$
39,379

Income tax expense (benefit)
 
 
 
Oil and gas operations
$
120,079

$
138,775

$
117,969

Natural gas distribution
26,670

29,875

27,353

Other
(1,048
)
(1,660
)
(1,351
)
Total
$
145,701

$
166,990

$
143,971

Capital expenditures
 
 
 
Oil and gas operations
$
1,115,452

$
717,782

$
427,399

Natural gas distribution
73,984

93,566

77,809

Total
$
1,189,436

$
811,348

$
505,208

Identifiable assets
 
 
 
Oil and gas operations
$
4,046,242

$
3,160,601

$
2,654,068

Natural gas distribution
1,163,959

1,166,899

1,084,666

Eliminations and other
27,215

36,060

64,384

Total
$
5,237,416

$
4,363,560

$
3,803,118

Property, plant and equipment, net
 
 
 
Oil and gas operations
$
3,806,787

$
2,936,284

$
2,422,623

Natural gas distribution
813,471

782,665

721,846

Other
518

278

—

Total
$
4,620,776

$
3,719,227

$
3,144,469