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Derivative and Hedging Instruments (Details-1) (USD $) | Mar. 31, 2013 MW MWh Dth | Dec. 31, 2012 MWh Dth MW
--- | --- | ---
Gross notional volume of open derivatives [Abstract] |  |
Commodity derivative contracts - MWh | 331,315 | 444,650
Commodity derivative contracts - Dth | 1,360,000 | 1,980,000
Financial transmission rights - MW | 1,085 | 2,670
Derivative fair values [Abstract] |  |
Exchange traded and financial transmission rights | $ 1,500,000 | $ 300,000
Purchased power agreement | (70,700,000) | (72,600,000)
Derivative instruments at fair value on the balance sheet [Line Items] |  |
Derivative liability (current) | 8,880,000 | 9,270,000
Derivative liability (long-term) | 61,810,000 | 63,320,000
Commodity Derivative Contracts [Member] |  |
Derivative instruments at fair value on the balance sheet [Line Items] |  |
Other current assets | 1,343,000 | 365,000
Other defered charges | 158,000 | 95,000
Derivative liability (current) | 30,000 | 394,000
Derivative liability (long-term) | 0 | 11,000
Offsetting Assets [Line Items] |  |
Gross amounts | 1,502,000 | 460,000
Gross amounts offset in balance sheet | (30,000) | (405,000)
Collateral posted against derivative positions | (465,000) | 0
Net amount presented in balance sheet | 1,007,000 | 55,000
Financial Transmission Rights [Member] |  |
Derivative instruments at fair value on the balance sheet [Line Items] |  |
Other current assets | 22,000 | 206,000
Derivative liability (current) | 0 | 0
Offsetting Assets [Line Items] |  |
Gross amounts | 22,000 | 206,000
Gross amounts offset in balance sheet | 0 | 0
Collateral posted against derivative positions | 0 | 0
Net amount presented in balance sheet | 22,000 | 206,000
Purchased Power Agreement [Member] |  |
Derivative instruments at fair value on the balance sheet [Line Items] |  |
Derivative liability (current) | 8,880,000 | 9,270,000
Derivative liability (long-term) | $ 61,810,000 | $ 63,320,000

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