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Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) (USD $) | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Low [Member] |  |
Commodity Contracts |  |
Natural gas financial swaps | $ 3.22 | $ 3.67
Electricity financial swaps | 8.91 | 7.12
Electricity physical forward purchase | 8.11 |
High [Member] |  |
Commodity Contracts |  |
Natural gas financial swaps | 4.71 | 5.21
Electricity financial swaps | 48.28 | 51.72
Electricity physical forward purchase | 50.49 |
Weighted Average [Member] |  |
Commodity Contracts |  |
Natural gas financial swaps | 3.87 | 4.28
Electricity financial swaps | 36.23 | 41.14
Electricity physical forward purchase | 32.67 |
Assets [Member] |  |
Commodity Contracts |  |
Natural gas financial swaps | 0 | 2,000,000
Electricity financial swaps | 0 | 0
Electricity physical forward purchase | 0 |
Total commodity contracts | 0 | 2,000,000
Liabilities [Member] |  |
Commodity Contracts |  |
Natural gas financial swaps | 25,000,000 | 8,000,000
Electricity financial swaps | 13,000,000 | 10,000,000
Electricity physical forward purchase | 26,000,000 |
Total commodity contracts | $ 64,000,000 | $ 18,000,000

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- Definition Electricity physical forward purchase + References No definition available. + Details
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- Definition Fnancial swaps - electricity + References No definition available. + Details
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- Definition Natural gas financial swaps + References No definition available. + Details
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- Details
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