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Derivative and Hedging Instruments (Details-2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Offsetting Assets [Line Items]
Collateral posted against derivative positions		$ (200)
Commodity Derivative Contracts [Member]
Offsetting Assets [Line Items]
Gross asset	223	1,523
Gross amounts offset in balance sheet	(223)	(99)
Collateral posted against derivative positions	0	(175)
Net amount presented in balance sheet	0	1,249
Financial Transmission Rights [Member]
Offsetting Assets [Line Items]
Gross asset	642	363
Gross amounts offset in balance sheet	0	0
Collateral posted against derivative positions	0	0
Net amount presented in balance sheet	$ 642	$ 363

Fair value, after the effects of master netting arrangements, of a financial asset or other 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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