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

A summary of oil and gas properties is as follows:

 

 

 

June 30,

2017

(Unaudited)

 

 

December 31,

2016

 

 

 

(In thousands)

 

Proved properties and equipment

 

$

654,074

 

 

$

538,695

 

Unproved properties

 

 

114,848

 

 

 

72,584

 

Less accumulated depreciation, depletion, amortization, and impairment

 

 

(223,433

)

 

 

(172,051

)

 

 

$

545,489

 

 

$

439,228