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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2012
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
 
Three months ended
 
March 31,
(in thousands)
2012
2011
Operating revenues
 
 
Oil and gas operations
$
223,957

$
216,792

Natural gas distribution
194,487

269,572

Total
$
418,444

$
486,364

Operating income (loss)
 
 
Oil and gas operations
$
26,005

$
85,059

Natural gas distribution
78,560

75,059

Eliminations and corporate expenses
(395
)
(237
)
Total
$
104,170

$
159,881

Other income (expense)
 
 
Oil and gas operations
$
(10,558
)
$
(5,447
)
Natural gas distribution
(3,004
)
(2,913
)
Eliminations and other
56

23

Total
$
(13,506
)
$
(8,337
)
Income before income taxes
$
90,664

$
151,544


(in thousands)
March 31, 2012
December 31, 2011

Identifiable assets
 
 
Oil and gas operations
$
4,249,943

$
4,046,242

Natural gas distribution
1,142,781

1,163,959

Eliminations and other
40,048

27,215

Total
$
5,432,772

$
5,237,416