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Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) (USD $) | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Low [Member] |  |
Commodity Contracts |  |
Natural gas financial swaps | $ 3.38 | $ 3.67
Electricity financial swaps | 10.83 | 7.12
Electricity physical forward purchase | 9.88 |
High [Member] |  |
Commodity Contracts |  |
Natural gas financial swaps | 5.27 | 5.21
Electricity financial swaps | 45.71 | 51.72
Electricity physical forward purchase | 49.37 |
Weighted Average [Member] |  |
Commodity Contracts |  |
Natural gas financial swaps | 4.12 | 4.28
Electricity financial swaps | 37.31 | 41.14
Electricity physical forward purchase | 35.00 |
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 | 14,000,000 | 8,000,000
Electricity financial swaps | 14,000,000 | 10,000,000
Electricity physical forward purchase | 28,000,000 |
Total commodity contracts | $ 56,000,000 | $ 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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