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Oil and Gas Properties (Tables)
 9 Months Ended
Sep. 30, 2017
Extractive Industries [Abstract]  
Summary of 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