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Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($) | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Low [Member] |  |
Commodity Contracts |  |
Electricity physical forward | $ 10.75 | $ 8.50
Natural gas financial swaps | 2.02 | 2.06
Fnancial swaps - electricity | 19.61 | 9.98
High [Member] |  |
Commodity Contracts |  |
Electricity physical forward | 53.80 | 84.47
Natural gas financial swaps | 3.66 | 3.70
Fnancial swaps - electricity | 34.25 | 27.36
Weighted Average [Member] |  |
Commodity Contracts |  |
Electricity physical forward | 28.67 | 30.69
Natural gas financial swaps | 2.54 | 2.54
Fnancial swaps - electricity | 28.15 | 19.26
Assets [Member] |  |
Commodity Contracts |  |
Electricity physical forward | 0 | 0
Natural gas financial swaps | 0 | 0
Fnancial swaps - electricity | 1,000,000 | 0
Total commodity contracts | 1,000,000 | 0
Liabilities [Member] |  |
Commodity Contracts |  |
Electricity physical forward | 144,000,000 | 105,000,000
Natural gas financial swaps | 14,000,000 | 14,000,000
Fnancial swaps - electricity | 1,000,000 | 0
Total commodity contracts | $ 159,000,000 | $ 119,000,000

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