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Segment Information (Tables)
9 Months Ended
Sep. 30, 2011
Segment Reporting [Abstract] 
Schedule of Segment Reporting Information, by Segment
 
Three months ended
 
Nine months ended
 
September 30,
 
September 30,
(in thousands)
2011
2010
 
2011
2010
Operating revenues
 
 
 
 
 
Oil and gas operations
$
318,952

$
234,111

 
$
779,834

$
706,311

Natural gas distribution
59,616

61,693

 
415,497

498,132

Total
$
378,568

$
295,804

 
$
1,195,331

$
1,204,443

Operating income (loss)
 
 
 
 
 
Oil and gas operations
$
161,331

$
76,644

 
$
351,808

$
289,385

Natural gas distribution
(10,681
)
(9,015
)
 
65,541

69,378

Eliminations and corporate expenses
(238
)
(309
)
 
(721
)
(952
)
Total
$
150,412

$
67,320

 
$
416,628

$
357,811

Other income (expense)
 
 
 
 
 
Oil and gas operations
$
(9,363
)
$
(4,848
)
 
$
(20,632
)
$
(17,274
)
Natural gas distribution
(4,162
)
(2,119
)
 
(10,115
)
(8,882
)
Eliminations and other
94

(463
)
 
182

(1,225
)
Total
$
(13,431
)
$
(7,430
)
 
$
(30,565
)
$
(27,381
)
Income before income taxes
$
136,981

$
59,890

 
$
386,063

$
330,430


(in thousands)
September 30, 2011
December 31, 2010

Identifiable assets
 
 
Oil and gas operations
$
3,752,437

$
3,160,601

Natural gas distribution
1,107,188

1,166,899

Eliminations and other
15,817

36,060

Total
$
4,875,442

$
4,363,560