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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2014
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
 
Three months ended
 
March 31,
(in thousands)
2014
2013
Operating revenues from continuing operations
 
 
Oil and gas operations
$
297,278

$
236,331

Natural gas distribution
263,900

237,685

Total
$
561,178

$
474,016

Operating income (loss) from continuing operations
 
 
Oil and gas operations
$
33,548

$
23,181

Natural gas distribution
72,351

79,293

Eliminations and corporate expenses
(1,300
)
(284
)
Total
$
104,599

$
102,190

Other income (expense) from continuing operations
 
 
Oil and gas operations
$
(13,819
)
$
(12,031
)
Natural gas distribution
(2,839
)
(3,130
)
Eliminations and other
348

74

Total
$
(16,310
)
$
(15,087
)
Income from continuing operations before income taxes
$
88,289

$
87,103


(in thousands)
March 31, 2014
December 31, 2013
Identifiable assets
 
 
Oil and gas operations
$
5,521,883

$
5,379,135

Natural gas distribution
1,209,375

1,193,413

Eliminations and other
49,132

49,664

Total
$
6,780,390

$
6,622,212