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Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Low [Member]
Commodity Contracts
Electricity physical forward	$ 11.85	$ 9.63
Natural gas financial swaps	3.41	3.16
Electricity financial futures	11.92	9.63
High [Member]
Commodity Contracts
Electricity physical forward	98.71	77.95
Natural gas financial swaps	5.52	4.49
Electricity financial futures	47.53	46.07
Weighted Average [Member]
Commodity Contracts
Electricity physical forward	42.61	40.18
Natural gas financial swaps	4.03	3.71
Electricity financial futures	39.87	33.01
Assets [Member]
Commodity Contracts
Electricity physical forward	0	0
Natural gas financial swaps	3,000,000	0
Electricity financial futures	0	1,000,000
Total commodity contracts	3,000,000	1,000,000
Liabilities [Member]
Commodity Contracts
Electricity physical forward	69,000,000	103,000,000
Natural gas financial swaps	12,000,000	23,000,000
Electricity financial futures	11,000,000	14,000,000
Total commodity contracts	$ 92,000,000	$ 140,000,000