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Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Low [Member]
Commodity Contracts
Electricity physical forward	$ 12.91	$ 9.63
Natural gas financial swaps	3.30	3.16
Electricity financial futures	12.91	9.63
High [Member]
Commodity Contracts
Electricity physical forward	110.96	77.95
Natural gas financial swaps	4.99	4.49
Electricity financial futures	43.34	46.07
Weighted Average [Member]
Commodity Contracts
Electricity physical forward	41.50	40.18
Natural gas financial swaps	3.86	3.71
Electricity financial futures	35.72	33.01
Assets [Member]
Commodity Contracts
Electricity physical forward	0	0
Natural gas financial swaps	1,000,000	0
Electricity financial futures	0	1,000,000
Total commodity contracts	1,000,000	1,000,000
Liabilities [Member]
Commodity Contracts
Electricity physical forward	65,000,000	103,000,000
Natural gas financial swaps	19,000,000	23,000,000
Electricity financial futures	15,000,000	14,000,000
Total commodity contracts	$ 99,000,000	$ 140,000,000