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Discontinued Operations (Tables)
 6 Months Ended
Jun. 30, 2018
Discontinued Operations and Disposal Groups [Abstract]  
Summarized Results from Discontinued Operations
Summarized results from discontinued operations were as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
 
(In thousands)
Revenues
$
—

 
$
4

 
$
—

 
$
13

Cost of oil and gas producing activities
—

 
(4
)
 
—

 
(10
)
Other operating expenses
—

 
1,043

 
—

 
989

Income from discontinued operations before income taxes
$
—

 
$
1,043

 
$
—

 
$
992

Gain on sale of assets before income taxes
—

 
100

 
—

 
100

Income tax benefit
—

 
86

 
—

 
555

Income from discontinued operations, net of taxes
$
—

 
$
1,229

 
$
—

 
$
1,647
Significant Operation and Investing Activities of DIscontinued Operations
Significant operating activities and investing activities of discontinued operations included in our consolidated statements of cash flows were as follows:
 
Six Months Ended June 30,
 
2018
 
2017
 
(In thousands)
Operating activities:
 
 
 
Accounts payable and other accrued liabilities
$
—

 
$
(3,000
)
 
$
—

 
$
(3,000
)
 
 
 
 
Investing activities:
 
 
 
Proceeds from sale of assets
$
—

 
$
100

 
$
—

 
$
100