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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligations

The following represents a reconciliation of the asset retirement obligations:

 

 

 

Years Ended December 31,

 

 

 

2016

 

 

2015

 

 

 

(In thousands)

 

Asset retirement obligations at beginning of period

 

$

7,488

 

 

$

6,835

 

Wells drilled during the year

 

 

154

 

 

 

331

 

Wells acquired during the year

 

 

28

 

 

 

176

 

Wells sold during the year

 

 

(4,780

)

 

 

(5

)

Accretion of discount

 

 

180

 

 

 

214

 

Revisions of previous estimates (1)

 

 

(205

)

 

 

13

 

Wells plugged and abandoned during the year

 

 

(182

)

 

 

(76

)

Asset retirement obligations at end of period

 

$

2,683

 

 

$

7,488

 

 

 

(1)

Revisions of previous estimates during the year ended December 31, 2016 are primarily attributable to changes in estimates of the timing of future costs for oilfield services required to plug and abandon wells.