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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2011
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
 
Three months ended
 
Six months ended
 
June 30,
 
June 30,
(in thousands)
2011
2010
 
2011
2010
Operating revenues
 
 
 
 
 
Oil and gas operations
$
244,090


$
234,586


 
$
460,882


$
472,200


Natural gas distribution
86,309


99,139


 
355,881


436,439


Total
$
330,399


$
333,725


 
$
816,763


$
908,639


Operating income (loss)
 
 
 
 
 
Oil and gas operations
$
105,418


$
95,456


 
$
190,477


$
212,741


Natural gas distribution
1,163


3,138


 
76,222


78,393


Eliminations and corporate expenses
(246
)
(301
)
 
(483
)
(643
)
Total
$
106,335


$
98,293


 
$
266,216


$
290,491


Other income (expense)
 
 
 
 
 
Oil and gas operations
$
(5,822
)
$
(6,555
)
 
$
(11,269
)
$
(12,426
)
Natural gas distribution
(3,040
)
(3,702
)
 
(5,953
)
(6,763
)
Eliminations and other
65


(548
)
 
88


(762
)
Total
$
(8,797
)
$
(10,805
)
 
$
(17,134
)
$
(19,951
)
Income before income taxes
$
97,538


$
87,488


 
$
249,082


$
270,540




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


Identifiable assets
 
 
Oil and gas operations
$
3,404,189


$
3,160,601


Natural gas distribution
1,070,831


1,166,899


Eliminations and other
36,374


36,060


Total
$
4,511,394


$
4,363,560