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Discontinued Operations (Tables)
 12 Months Ended
Dec. 31, 2016
Discontinued Operations and Disposal Groups [Abstract]  
Summarized Results from Discontinued Operations
Summarized results from discontinued operations were as follows:
 
For the Year
 
2016
 
2015
 
2014
 
 
 
 
Revenues
$
5,862

 
$
43,845

 
$
68,610

Cost of oil and gas producing activities
(6,578
)
 
(221,402
)
 
(94,581
)
Other operating expenses
(7,754
)
 
(10,363
)
 
(14,357
)
Loss from discontinued operations before income taxes
$
(8,470
)
 
$
(187,920
)
 
$
(40,328
)
Gain (loss) on sale of assets before income taxes
(13,664
)
 
(706
)
 
8,526

Income tax benefit
5,269

 
2,496

 
12,193

Loss from discontinued operations, net of taxes
$
(16,865
)
 
$
(186,130
)
 
$
(19,609
)
Disposal Groups, Including Discontinued Operations
The major classes of assets and liabilities of discontinued operations at year-end 2016 and 2015 are as follows:
 
At Year-End
 
2016
 
2015
 
(In thousands)
Assets of Discontinued Operations:
 
 
 
Receivables, net of allowance for bad debt
$
6

 
$
4,632

Oil and gas properties and equipment, net
—

 
79,733

Goodwill and other intangible assets
—

 
19,673

Prepaid expenses
8

 
96

Other assets
—

 
833

 
$
14

 
$
104,967

 
 
 
 
Liabilities of Discontinued Operations:
 
 
 
Accounts payable
$
67

 
$
342

Accrued property taxes
—

 
259

Other accrued expenses
5,228

 
8,924

Other liabilities
—

 
1,667

 
$
5,295

 
$
11,192
Significant Operation and Investing Activities of DIscontinued Operations
Significant operating activities and investing activities of discontinued operations are as follows:
 
For the Year
 
2016
 
2015
 
2014
 
(In thousands)
Operating activities:
 
 
 
 
 
Asset impairments
$
612

 
$
105,337

 
$
15,535

Dry hole and unproved leasehold impairment charges
—

 
67,639

 
29,528

Loss (gain) on sale of assets
13,664

 
706

 
(8,526
)
Depreciation, depletion and amortization
2,202

 
28,391

 
28,758

 
$
16,478

 
$
202,073

 
$
65,295

 
 
 
 
 
 
Investing activities:
 
 
 
 
 
Oil and gas properties and equipment
$
(579
)
 
$
(49,717
)
 
$
(101,145
)
Acquisition of oil and gas properties
—

 
—

 
(1,100
)
Proceeds from sales of assets
77,105

 
17,800

 
17,660

 
$
76,526

 
$
(31,917
)
 
$
(84,585
)