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Derivative Financial Instruments - Oil and Gas Commodity Contracts (Details)
bbl in Thousands, MMBTU in Thousands, MBbls in Thousands, $ in Millions
Sep. 30, 2015
USD ($)
MMBTU
$ / MMBTU
$ / bbl
MBbls
Sep. 30, 2014
MMBTU
bbl
Natural Gas Commodity Contract    
Derivative [Line Items]    
Natural Gas, Volume | MMBTU 3,380  
Fair Value at September 30, 2015 $ 3.9  
Oil Commodity Contract    
Derivative [Line Items]    
Fair Value at September 30, 2015 $ 4.0  
Derivative, Commodity Contract, Oil Volume | MBbls 273  
Three-way collar [Member] | Natural Gas Commodity Contract | Remainder of 2013    
Derivative [Line Items]    
Natural Gas, Volume | MMBTU 620  
Fair Value at September 30, 2015 $ 0.2  
Three-way collar [Member] | Natural Gas Commodity Contract- Short put [Member] | Remainder of 2013    
Derivative [Line Items]    
Weighted average strike price per Mmbtu/Bbl | $ / MMBTU 2.10  
Three-way collar [Member] | Oil Commodity Contract | Remainder of 2013    
Derivative [Line Items]    
Fair Value at September 30, 2015 $ 0.8  
Derivative, Commodity Contract, Oil Volume | MBbls 183  
Three-way collar [Member] | Natural Gas Commodity Option Contract- Short call [Member] [Member] | Remainder of 2013    
Derivative [Line Items]    
Weighted average strike price per Mmbtu/Bbl | $ / MMBTU 3.27  
Three-way collar [Member] | Natural Gas Commodity Commodity Contract- Long put [Member] | Remainder of 2013    
Derivative [Line Items]    
Weighted average strike price per Mmbtu/Bbl | $ / MMBTU 2.85  
Swap | Natural Gas Commodity Contract    
Derivative [Line Items]    
Natural Gas, Volume | MMBTU   6,821
Swap | Natural Gas Commodity Contract | Remainder of 2013    
Derivative [Line Items]    
Natural Gas, Volume | MMBTU 2,760  
Weighted average strike price per Mmbtu/Bbl | $ / MMBTU 3.95  
Fair Value at September 30, 2015 $ 3.7  
Swap | Oil Commodity Contract    
Derivative [Line Items]    
Derivative, Commodity Contract, Oil Volume | bbl   254
Swap | Oil Commodity Contract | Remainder of 2013    
Derivative [Line Items]    
Weighted average strike price per Mmbtu/Bbl | $ / bbl 94.98  
Fair Value at September 30, 2015 $ 3.1  
Derivative, Commodity Contract, Oil Volume | MBbls 62  
Collar [Member] | Natural Gas Commodity Contract | Remainder of 2013    
Derivative [Line Items]    
Fair Value at September 30, 2015 $ 0.1  
Collar [Member] | Oil Commodity Contract | Remainder of 2013    
Derivative [Line Items]    
Derivative, Commodity Contract, Oil Volume | MBbls 28  
Oil and Gas Properties [Member] | Energy Related Derivative [Member]    
Derivative [Line Items]    
Fair Value at September 30, 2015 $ 7.9  
Short call [Member] | Three-way collar [Member] | Oil Commodity Contract | Remainder of 2013    
Derivative [Line Items]    
Weighted average strike price per Mmbtu/Bbl | $ / bbl 76.00  
Short call [Member] | Collar [Member] | Oil Commodity Contract | Remainder of 2013    
Derivative [Line Items]    
Weighted average strike price per Mmbtu/Bbl | $ / bbl 67.50  
Long put [Member] | Three-way collar [Member] | Oil Commodity Contract | Remainder of 2013    
Derivative [Line Items]    
Weighted average strike price per Mmbtu/Bbl | $ / bbl 56.00  
Long put [Member] | Collar [Member] | Oil Commodity Contract | Remainder of 2013    
Derivative [Line Items]    
Weighted average strike price per Mmbtu/Bbl | $ / bbl 50.00  
Short put [Member] | Three-way collar [Member] | Oil Commodity Contract | Remainder of 2013    
Derivative [Line Items]    
Weighted average strike price per Mmbtu/Bbl | $ / bbl 42.00