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Derivative Financial Instruments - Oil and Gas Commodity Contracts (Details) (Swap, USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
MMBTU
Sep. 30, 2013
MMBTU
Derivative [Line Items]    
September 30, 2014 $ 1.6  
Natural Gas Commodity Contract
   
Derivative [Line Items]    
Natural Gas, Volume 6,821,000.0 16,018,000.0
September 30, 2014 0.1  
Natural Gas Commodity Contract | Remainder of 2013
   
Derivative [Line Items]    
Natural Gas, Volume 4,106,000.0  
Weighted average strike price per Mmbtu/Bbl 4.15  
September 30, 2014 0.2  
Natural Gas Commodity Contract | 2014
   
Derivative [Line Items]    
Natural Gas, Volume 2,715,000.0  
Weighted average strike price per Mmbtu/Bbl 3.98  
September 30, 2014 (0.1)  
Oil Commodity Contract
   
Derivative [Line Items]    
September 30, 2014 1.5  
Derivative, Commodity Contract, Oil Volume 254,000.0 375.0
Oil Commodity Contract | Remainder of 2013
   
Derivative [Line Items]    
Weighted average strike price per Mmbtu/Bbl 91.87  
September 30, 2014 0.1  
Derivative, Commodity Contract, Oil Volume 68,000.0  
Oil Commodity Contract | 2014
   
Derivative [Line Items]    
Weighted average strike price per Mmbtu/Bbl 94.98  
September 30, 2014 $ 1.4  
Derivative, Commodity Contract, Oil Volume 186,000.0