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Commitments and Contingencies (Details)
 3 Months Ended
Oct. 07, 2015
USD ($)
Apr. 05, 2011
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jul. 15, 2013
plaintiff
Mar. 31, 2013
claim
Shareholder Derivative Actions            
Commitments and Contingencies Disclosure            
Number of shareholder derivative actions claims filed | claim           7
James Hart And Other Named Plaintiffs            
Commitments and Contingencies Disclosure            
Loss Contingency, Number Of Additional Plaintiffs | plaintiff         15  
Litigation reserve established       $ 5,100,000    
Pending Litigation | Shareholder Derivative Actions            
Commitments and Contingencies Disclosure            
Escrow fund amount established $ 38,000,000          
Settled Litigation | Shareholder Derivative Actions            
Commitments and Contingencies Disclosure            
Litigation Settlement, Amount     $ 500,000      
Litigation, Plaintiff Counsel Fees, Maximum     120,000      
Litigation, Incentive Awards, Maximum     $ 15,000      
Wesley West Minerals, Ltd and Longfellow Ranch Partners, LP            
Commitments and Contingencies Disclosure            
Damages sought by plaintiff   $ 45,500,000        
General Land Office of the State of Texas            
Commitments and Contingencies Disclosure            
Damages sought by plaintiff   $ 13,000,000