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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Accounting Policies [Abstract]  
Schedule of Change in Asset Retirement Obligation
The following summarizes the changes in asset retirement obligations:
 
Year-End
 
2016
 
2015
 
(In thousands)
Beginning balance
$
1,758

 
$
1,807

Additions
6

 
65

Oil and gas working interest property dispositions
(1,610
)
 
(119
)
Liabilities settled
(107
)
 
(139
)
Accretion expense
56

 
144

 
$
103

 
$
1,758
Schedule of Property, Plant and Equipment
We depreciate these assets using the straight-line method over their estimated useful lives as follows:
 
Estimated
 
Year-End
 
Useful Lives
 
2016
 
2015
 
 
 
(In thousands)
Buildings and building improvements
10 to 40 years
 
$
2,700

 
$
4,044

Property and equipment
2 to 10 years
 
4,957

 
12,230

 
 
 
7,657

 
16,274

Less: accumulated depreciation
 
 
(4,541
)
 
(5,542
)
 
 
 
$
3,116

 
$
10,732