Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Narrative) (Details)

v3.5.0.2
Acquisitions (Narrative) (Details)
$ in Thousands
Aug. 03, 2016
USD ($)
May 26, 2016
USD ($)
a
shares
May 16, 2016
USD ($)
a
Jan. 18, 2016
USD ($)
Howard County, Texas [Member] | Big Star Transaction [Member]        
Business Acquisition [Line Items]        
Consideration transferred   $ 220,000    
Aggregate purchase price   $ 329,573    
Shares of common stock issued in acquisition | shares   9,333,333    
Gas and oil area, developed and undeveloped, gross | a   17,298    
Gas and oil area, developed and undeveloped, net | a   14,089    
Working interest   81.00%    
Net revenue interest   61.00%    
Casselman-Bohannon Fields [Member]        
Business Acquisition [Line Items]        
Aggregate purchase price       $ 10,183
Working interest       71.30%
Net revenue interest       53.50%
Casselman-Bohannon Fields [Member] | Additional Acquisition [Member]        
Business Acquisition [Line Items]        
Consideration transferred       $ 10,183
Working interest       4.90%
Net revenue interest       3.70%
Casselman-Bohannon Fields [Member] | Subsequent Event [Member]        
Business Acquisition [Line Items]        
Consideration transferred $ 13,000      
Working interest 75.30%      
Net revenue interest 58.50%      
Casselman-Bohannon Fields [Member] | Subsequent Event [Member] | Additional Acquisition [Member]        
Business Acquisition [Line Items]        
Working interest 4.00%      
Net revenue interest 3.00%      
Western Reagan County, Texas [Member] | AMI Transaction [Member]        
Business Acquisition [Line Items]        
Consideration transferred     $ 33,012  
Aggregate purchase price     $ 33,012  
Western Reagan County, Texas [Member] | AMI Transaction [Member] | TRP Energy, LLC [Member]        
Business Acquisition [Line Items]        
Gas and oil area, developed and undeveloped, net | a     4,745  
Percentage of ownership interest acquired     55.00%  
Sale of ownership interest, percent     27.50%