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Oil and Gas Properties (Tables)
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Extractive Industries [Abstract]    
Summary of Oil and Gas Properties

A summary of oil and gas properties follows:

 

     September 30,
2016
(unaudited)		     December 31,
2015		  
     (In thousands)  

Proved properties and equipment

    $ 525,809      $ 584,692   

Proved properties and equipment held for sale

      79,537        —     

Unproved properties

      71,658        70,298   

Less accumulated depreciation, depletion, and amortization

      (160,793 )      (166,890 ) 

Less accumulated depreciation, depletion, amortization, and impairment on properties held for sale

      (65,922 )      —     
  

 

 

    

 

 

  
   $ 450,289      $ 488,100   
  

 

 

    

 

 

  

A summary of oil and gas properties as of December 31, follows:

 

     2015      2014  

Proved properties and equipment

    $ 584,691,945       $ 495,954,566   

Unproved properties

      70,298,349         65,725,668   

Less accumulated depreciation, depletion, and amortization

      (166,890,697 )       (80,600,959 ) 
  

 

 

     

 

 

  
   $ 488,099,597       $ 481,079,275