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Derivative Financial Instruments Derivative Financial Instruments - Oil and Gas Commodity Contracts (Details) bbl in Thousands, MMBTU in Thousands, MBbls in Millions, $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) MMBTU $ / MMBTU $ / bbl MBbls | Dec. 31, 2014 | Sep. 30, 2015 MMBTU bbl
Derivative [Line Items] |  |  |
Derivative, Percentage of Production Volume Covered by Derivative Financial Instruments | 60.00% | 71.00% |
Natural Gas Commodity Contract [Member] |  |  |
Derivative [Line Items] |  |  |
Natural Gas, Volume | MMBTU | 3,350,000 |  |
Fair Value at December 31, 2015 | $ (0.2) |  |
Oil Commodity Contract [Member] |  |  |
Derivative [Line Items] |  |  |
Fair Value at December 31, 2015 | $ 1.5 |  |
Derivative, Commodity Contract, Oil Volume | MBbls | 183 |  |
Swap [Member] | Natural Gas Commodity Contract [Member] |  |  |
Derivative [Line Items] |  |  |
Natural Gas, Volume | MMBTU |  |  | 3,380
Swap [Member] | Oil Commodity Contract [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Commodity Contract, Oil Volume | bbl |  |  | 273
Swap [Member] | Energy Related Derivative [Member] |  |  |
Derivative [Line Items] |  |  |
Fair Value at December 31, 2015 | $ 1.3 |  |
Collar [Member] | Natural Gas Commodity Contract [Member] | Remainder of 2014 [Member] |  |  |
Derivative [Line Items] |  |  |
Fair Value at December 31, 2015 | $ 1.5 |  |
Collar [Member] | Oil Commodity Contract [Member] | Remainder of 2014 [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Commodity Contract, Oil Volume | MBbls | 183 |  |
Three-way collar [Member] | Natural Gas Commodity Contract [Member] | Remainder of 2014 [Member] |  |  |
Derivative [Line Items] |  |  |
Natural Gas, Volume | MMBTU | 3,350,000 |  |
Fair Value at December 31, 2015 | $ (0.2) |  |
Three-way collar [Member] | Natural Gas Commodity Option Contract- Short call [Member] [Member] | Remainder of 2014 [Member] |  |  |
Derivative [Line Items] |  |  |
Weighted average strike price per Mmbtu/Bbl | $ / MMBTU | 2.77 |  |
Three-way collar [Member] | Natural Gas Commodity Commodity Contract- Long put [Member] | Remainder of 2014 [Member] |  |  |
Derivative [Line Items] |  |  |
Weighted average strike price per Mmbtu/Bbl | $ / MMBTU | 2.15 |  |
Short put [Member] | Collar [Member] | Oil Commodity Contract [Member] | Remainder of 2014 [Member] |  |  |
Derivative [Line Items] |  |  |
Weighted average strike price per Mmbtu/Bbl | $ / bbl | 42.00 |  |
Long put [Member] | Collar [Member] | Oil Commodity Contract [Member] | Remainder of 2014 [Member] |  |  |
Derivative [Line Items] |  |  |
Weighted average strike price per Mmbtu/Bbl | $ / bbl | 56.00 |  |
Short call [Member] | Collar [Member] | Oil Commodity Contract [Member] | Remainder of 2014 [Member] |  |  |
Derivative [Line Items] |  |  |
Weighted average strike price per Mmbtu/Bbl | $ / bbl | 76.00 |  |

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