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Business Segments (Tables)
 6 Months Ended
Jun. 30, 2013
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information
The following tables present our segment information:

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
 
(in thousands)
Revenues:
 
 
 
 
 
 
 
Oil and gas exploration and production
$
103,226

 
$
91,127

 
$
161,382

 
$
170,752

Gas marketing
18,079

 
8,613

 
31,749

 
19,994

Total revenues
$
121,305

 
$
99,740

 
$
193,131

 
$
190,746

 
 
 
 
 
 
 
 
Segment income (loss) before income taxes:
 
 
 
 
 
 
 
Oil and gas exploration and production
$
56,372

 
$
55,694

 
$
22,671

 
$
93,118

Gas marketing
13

 
123

 
(52
)
 
413

Unallocated
(30,092
)
 
(26,426
)
 
(59,773
)
 
(53,256
)
Total
$
26,293

 
$
29,391

 
$
(37,154
)
 
$
40,275

 
 
 
 
 
 
 
 

 
June 30, 2013
 
December 31, 2012
 
(in thousands)
Segment assets:
 
 
 
Oil and gas exploration and production
$
1,557,352

 
$
1,723,011

Gas marketing
34,097

 
11,090

Unallocated
67,826

 
92,747

Assets held for sale
32,160

 
—

Total Assets
$
1,691,435

 
$
1,826,848