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Oil and Gas Properties
 9 Months Ended
Sep. 30, 2017
Extractive Industries [Abstract]  
Oil and Gas Properties

7. Oil and Gas Properties

A summary of oil and gas properties is as follows:

 

 

 

September 30,

2017

(Unaudited)

 

 

December 31,

2016

 

 

 

(In thousands)

 

Proved properties and equipment

 

$

712,866

 

 

$

538,695

 

Unproved properties

 

 

79,143

 

 

 

72,584

 

Less accumulated depletion and impairment

 

 

(239,090

)

 

 

(172,051

)

 

 

$

552,919

 

 

$

439,228

 

 

Depletion expense was approximately $39,960,000 for the nine months ended September 30, 2017 and approximately $46,286,000 for the year ended December 31, 2016.  Impairment expense was approximately $27,081,000 for the nine months ended September 30, 2017 and approximately $33,893,000 for the year ended December 31, 2016.