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Derivative Financial Instruments Derivative Financial Instruments - Oil and Gas Commodity Contracts (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  |  |  |  |
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Dec. 31, 2013 | Dec. 31, 2013 Swap [Member] Natural Gas Commodity Contract [Member] MMBTU | Sep. 30, 2013 Swap [Member] Natural Gas Commodity Contract [Member] MMBTU | Dec. 31, 2013 Swap [Member] Natural Gas Commodity Contract [Member] Remainder of 2013 [Member] MMBTU | Dec. 31, 2013 Swap [Member] Oil Commodity Contract [Member] MBbls | Sep. 30, 2013 Swap [Member] Oil Commodity Contract [Member] MBbls | Dec. 31, 2013 Swap [Member] Oil Commodity Contract [Member] Remainder of 2013 [Member] MBbls | Dec. 31, 2013 Swap [Member] Oil Commodity Contract [Member] Year Four [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |
Document Period End Date | Dec. 31, 2013 |  |  |  |  |  |  |
Natural Gas, Volume |  | 16,316,000.0 | 16,018,000.0 | 16,316,000.0 |  |  |  |
Weighted average strike price per Mmbtu/Bbl |  |  |  | 4.15 |  |  | 91.87 |
December 31, 2013 |  | $ (0.7) |  | $ (0.7) | $ (1.0) |  | $ (1.0) | $ (1.7)
Derivative, Commodity Contract, Oil Volume |  |  |  |  | 272,000.0 | 375.0 | 272,000.0 |

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