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Derivative Financial Instruments Derivative Financial Instruments - Oil and Gas Commodity Contracts (Details) (Swap [Member], USD $) In Millions, unless otherwise specified | Mar. 31, 2013
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Derivative [Line Items] |
Fair value at March 31, 2013 | $ (8.1)
Natural Gas Commodity Contract [Member] |
Derivative [Line Items] |
Natural Gas, Volume | 26,200,000
Fair value at March 31, 2013 | (7.0)
Natural Gas Commodity Contract [Member] | Remainder of 2013 [Member] |
Derivative [Line Items] |
Natural Gas, Volume | 15,400,000
Weighted average strike price per Mmbtu/Bbl | 3.72
Fair value at March 31, 2013 | (6.0)
Natural Gas Commodity Contract [Member] | 2014 [Member] |
Derivative [Line Items] |
Natural Gas, Volume | 10,900,000
Weighted average strike price per Mmbtu/Bbl | 4.14
Fair value at March 31, 2013 | (1.0)
Oil Commodity Contract [Member] |
Derivative [Line Items] |
Swap, Volume | 600,000
Fair value at March 31, 2013 | (1.1)
Oil Commodity Contract [Member] | Remainder of 2013 [Member] |
Derivative [Line Items] |
Swap, Volume | 300,000
Weighted average strike price per Mmbtu/Bbl | 94.05
Fair value at March 31, 2013 | (0.8)
Oil Commodity Contract [Member] | 2014 [Member] |
Derivative [Line Items] |
Swap, Volume | 300,000
Weighted average strike price per Mmbtu/Bbl | 91.87
Fair value at March 31, 2013 | $ (0.3)

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