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Derivative and Hedging Instruments (Details-2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Offsetting Assets [Line Items]
Collateral posted against derivative positions	$ (200)	$ 0
Commodity Derivative Contracts [Member]
Offsetting Assets [Line Items]
Gross asset	1,523	460
Gross amounts offset in balance sheet	(99)	(405)
Collateral posted against derivative positions	(175)	0
Net amount presented in balance sheet	1,249	55
Financial Transmission Rights [Member]
Offsetting Assets [Line Items]
Gross asset	363	206
Gross amounts offset in balance sheet	0	0
Collateral posted against derivative positions	0	0
Net amount presented in balance sheet	$ 363	$ 206

Fair value of liability associated with derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References+ Details

- Definition

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details