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Commitments and Contingencies - Narrative (Details)
Mcf in Millions
 12 Months Ended
Oct. 07, 2015
USD ($)
Apr. 05, 2011
USD ($)
Dec. 31, 2015
USD ($)
$ / Mcf
Mcf
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 26, 2014
director
Jul. 15, 2013
plaintiff
Mar. 31, 2013
claim
Mar. 06, 2013
claim
Commitments and Contingencies Disclosure [Line Items]                  
Total rental expense under operating leases     $ 1,000,000 $ 1,700,000 $ 3,600,000        
Number of independent company directors that formed a Special Litigation Committee | director           2      
Number of claims consolidated by the court | claim                 2
Treating Agreement                  
Commitments and Contingencies Disclosure [Line Items]                  
Contract agreement, term     30 years            
Minimum delivery required (in Bcf) | Mcf     3,200.0            
Initial shortfall price, per Mcf (in dollars per mcf) | $ / Mcf     0.25            
Cumulative deliveries (in Bcf) | Mcf     73.1            
Cumulative shortfall (in Bcf) | Mcf     439.6            
Cumulative shortfall accrued     $ 109,900,000            
Wesley West Minerals, Ltd and Longfellow Ranch Partners, LP                  
Commitments and Contingencies Disclosure [Line Items]                  
Loss contingency, damages sought, value   $ 45,500,000              
General Land Office of the State of Texas                  
Commitments and Contingencies Disclosure [Line Items]                  
Loss contingency, damages sought, value   $ 13,000,000              
Shareholder Derivative Actions                  
Commitments and Contingencies Disclosure [Line Items]                  
Number of putative shareholder derivative actions filed | claim               7  
Rig Commitments                  
Commitments and Contingencies Disclosure [Line Items]                  
Minimum future commitments, 2016     2,500,000            
Minimum future commitments, 2017     0            
Federal Shareholder Derivative Litigation And Others | Pending Litigation                  
Commitments and Contingencies Disclosure [Line Items]                  
Proposed escrow fund amount to be established by insurers of individual defendants to litigation settlement $ 38,000,000                
James Hart And Other Named Plaintiffs                  
Commitments and Contingencies Disclosure [Line Items]                  
Number of additional plaintiffs | plaintiff             15    
Reserve established for lawsuit     $ 5,100,000