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Derivative and Hedging Instruments (Details-3) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Offsetting Liabilities [Line Items]
Collateral posted against derivative positions	$ (600)	$ (2,200)
Commodity Derivative Contracts [Member]
Offsetting Liabilities [Line Items]
Gross amounts	937	2,433
Gross amounts offset in balance sheet	(343)	(223)
Collateral posted against derivative positions	(565)	(2,179)
Net amount presented in balance sheet	29	31
Purchased Power Agreement [Member]
Offsetting Liabilities [Line Items]
Gross amounts	53,410	53,430
Gross amounts offset in balance sheet	0	0
Collateral posted against derivative positions	0	0
Net amount presented in balance sheet	$ 53,410	$ 53,430

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 assets not subject to a master netting arrangement and not elected to be offset.

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