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Segment Information
 12 Months Ended
Dec. 31, 2012
Segment Reporting [Abstract]  
Segment Information
Segment Information
 
We have two reportable operating segments, which are oil and gas exploration and production and contract drilling services. The following tables present selected financial information regarding our operating segments for 2012, 2011 and 2010.
 
 
 
 
 
Contract
 
Intercompany
 
Consolidated
For the Year Ended December 31, 2012
 
Oil and Gas
 
Drilling
 
Eliminations
 
Total
 
 
(In thousands)
Revenues
 
$
407,194

 
$
57,218

 
$
(41,360
)
 
$
423,052

Depreciation, depletion and amortization(a)
 
140,967

 
14,442

 
(6,778
)
 
148,631

Other operating expenses(b)
 
176,922

 
52,678

 
(34,972
)
 
194,628

Interest expense
 
38,664

 
—

 
—

 
38,664

Other (income) expense
 
(15,979
)
 
(3
)
 
—

 
(15,982
)
Income (loss) before income taxes
 
66,620

 
(9,899
)
 
390

 
57,111

Income tax (expense) benefit
 
(25,473
)
 
3,465

 
—

 
(22,008
)
Net income (loss)
 
$
41,147

 
$
(6,434
)
 
$
390

 
$
35,103

Total assets
 
$
1,535,544

 
$
64,045

 
$
(25,005
)
 
$
1,574,584

Additions to property and equipment
 
$
510,924

 
$
15,207

 
$
390

 
$
526,521


 
 
 
 
Contract
 
Intercompany
 
Consolidated
For the Year Ended December 31, 2011
 
Oil and Gas
 
Drilling
 
Eliminations
 
Total
 
 
(In thousands)
Revenues
 
$
422,368

 
$
52,716

 
$
(48,656
)
 
$
426,428

Depreciation, depletion and amortization(a)
 
112,863

 
12,214

 
(9,842
)
 
115,235

Other operating expenses(b)
 
174,027

 
44,318

 
(38,957
)
 
179,388

Interest expense
 
32,919

 
—

 
—

 
32,919

Other (income) expense
 
(33,280
)
 
(13,799
)
 
—

 
(47,079
)
Income (loss) before income taxes
 
135,839

 
9,983

 
143

 
145,965

Income tax (expense) benefit
 
(48,648
)
 
(3,494
)
 
—

 
(52,142
)
Net income (loss)
 
$
87,191

 
$
6,489

 
$
143

 
$
93,823

Total assets
 
$
1,178,725

 
$
62,846

 
$
(15,300
)
 
$
1,226,271

Additions to property and equipment
 
$
395,292

 
$
17,578

 
$
143

 
$
413,013

 
 
 
 
 
Contract
 
Intercompany
 
Consolidated
For the Year Ended December 31, 2010
 
Oil and Gas
 
Drilling
 
Eliminations
 
Total
 
 
(In thousands)
Revenues
 
$
331,631

 
$
35,269

 
$
(35,269
)
 
$
331,631

Depreciation, depletion and amortization(a)
 
111,353

 
10,044

 
(8,344
)
 
113,053

Other operating expenses(b)
 
139,212

 
26,916

 
(25,494
)
 
140,634

Interest expense
 
24,397

 
5

 
—

 
24,402

Other (income) expense
 
(4,030
)
 
—

 
—

 
(4,030
)
Income (loss) before income taxes
 
60,699

 
(1,696
)
 
(1,431
)
 
57,572

Income tax (expense) benefit
 
(21,228
)
 
594

 
—

 
(20,634
)
Net income (loss)
 
$
39,471

 
$
(1,102
)
 
$
(1,431
)
 
$
36,938

Total assets
 
$
854,621

 
$
48,414

 
$
(12,118
)
 
$
890,917

Additions to property and equipment
 
$
270,108

 
$
16,978

 
$
(1,431
)
 
$
285,655

    
(a)
Includes impairment of property and equipment.
(b)
Includes the following expenses:  production, exploration, midstream services, drilling rig services, accretion of asset retirement obligations, general and administrative, and other operating expenses.