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Derivative and Hedging Instruments (Details-3) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Commodity Derivative Contracts [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross liability | $ 99 | $ 405
Gross amounts offset in balance sheet | (99) | (405)
Collateral posted against derivative positions | 0 | 0
Net amount presented in the balance sheet | 0 | 0
Ten-year PPA [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross liability | 65,680 | 72,590
Gross amounts offset in balance sheet | 0 | 0
Collateral posted against derivative positions | 0 | 0
Net amount presented in the balance sheet | $ 65,680 | $ 72,590

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