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Derivative and Hedging Instruments (Details-2) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Commodity Derivative Contracts [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts | $ 30 | $ 405
Gross amounts offset in balance sheet | (30) | (405)
Collateral posted against derivative positions | 0 | 0
Net amount presented in balance sheet | 0 | 0
Purchased Power Agreement [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts | 70,690 | 72,590
Gross amounts offset in balance sheet | 0 | 0
Collateral posted against derivative positions | 0 | 0
Net amount presented in balance sheet | $ 70,690 | $ 72,590

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