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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 |

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