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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2012
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
 
Three months ended
 
Nine months ended
 
September 30,
 
September 30,
(in thousands)
2012
2011
 
2012
2011
Operating revenues
 
 
 
 
 
Oil and gas operations
$
233,515

$
318,952

 
$
856,940

$
779,834

Natural gas distribution
61,809

59,616

 
327,183

415,497

Total
$
295,324

$
378,568

 
$
1,184,123

$
1,195,331

Operating income (loss)
 
 
 
 
 
Oil and gas operations
$
32,407

$
161,331

 
$
274,818

$
351,808

Natural gas distribution
(12,743
)
(10,681
)
 
70,265

65,541

Eliminations and corporate expenses
(206
)
(238
)
 
(857
)
(721
)
Total
$
19,458

$
150,412

 
$
344,226

$
416,628

Other income (expense)
 
 
 
 
 
Oil and gas operations
$
(12,633
)
$
(9,363
)
 
$
(35,195
)
$
(20,632
)
Natural gas distribution
(3,274
)
(4,162
)
 
(10,062
)
(10,115
)
Eliminations and other
148

94

 
234

182

Total
$
(15,759
)
$
(13,431
)
 
$
(45,023
)
$
(30,565
)
Income before income taxes
$
3,699

$
136,981

 
$
299,203

$
386,063


(in thousands)
September 30, 2012
December 31, 2011

Identifiable assets
 
 
Oil and gas operations
$
4,734,269

$
4,046,242

Natural gas distribution
1,120,161

1,163,959

Eliminations and other
65,399

27,215

Total
$
5,919,829

$
5,237,416