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Acquisitions and Dispositions (Tables)
 6 Months Ended
Jun. 30, 2017
Business Combinations [Abstract]  
Schedule of Fair Values of the Properties Acquired
 
(In thousands)
Proved oil and natural gas properties
$
3,331

Unproved oil and natural gas properties
18,802

Net working capital
204

    Total fair value
$
22,337

The following table summarizes the fair values assigned to the properties acquired:
 
 
(In thousands)
Proved oil and natural gas properties
$
20,787

Unproved oil and natural gas properties
65,745

Net working capital
1,026

   Total fair value
$
87,558

 
(In thousands)
Proved oil and natural gas properties
$
5,006

Unproved oil and natural gas properties
45,477

    Total fair value
$
50,483

The following table summarizes the fair values assigned to the properties acquired:
 
 
(In thousands)
Proved oil and natural gas properties
$
18,948

Unproved oil and natural gas properties
14,082

Net working capital
1,038

Asset retirement obligations
(50
)
   Total fair value
$
34,018

 
(In thousands)
Proved oil and natural gas properties
$
1,804

Unproved oil and natural gas properties
15,206

Net working capital
59

    Total fair value
$
17,069