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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2013
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
 
Three months ended
 
March 31,
(in thousands)
2013
2012
Operating revenues
 
 
Oil and gas operations
$
254,994

$
223,957

Natural gas distribution
237,685

194,487

Total
$
492,679

$
418,444

Operating income (loss)
 
 
Oil and gas operations
$
26,327

$
26,005

Natural gas distribution
79,293

78,560

Eliminations and corporate expenses
(284
)
(395
)
Total
$
105,336

$
104,170

Other income (expense)
 
 
Oil and gas operations
$
(11,993
)
$
(10,558
)
Natural gas distribution
(3,130
)
(3,004
)
Eliminations and other
58

56

Total
$
(15,065
)
$
(13,506
)
Income before income taxes
$
90,271

$
90,664


(in thousands)
March 31, 2013
December 31, 2012

Identifiable assets
 
 
Oil and gas operations
$
5,100,983

$
4,975,170

Natural gas distribution
1,155,950

1,177,134

Eliminations and other
36,245

23,586

Total
$
6,293,178

$
6,175,890