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Derivative and Hedging Instruments (Details-3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Offsetting Liabilities [Line Items]
Collateral posted against derivative positions	$ (2,200)
Commodity Derivative Contracts [Member]
Offsetting Liabilities [Line Items]
Gross liability	2,433	99
Gross amounts offset in balance sheet	(223)	(99)
Collateral posted against derivative positions	(2,179)	0
Net amount presented in the balance sheet	31	0
Ten-year PPA [Member]
Offsetting Liabilities [Line Items]
Gross liability	53,430	65,680
Gross amounts offset in balance sheet	0	0
Collateral posted against derivative positions	0	0
Net amount presented in the balance sheet	$ 53,430	$ 65,680

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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