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Derivative Instruments (Details 5) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013
Natural gas swaps
Assets:
Gross Amounts of Recognized Assets (Liabilities)	$ (409)
Gross Amounts offset on the Balance Sheet	212
Net Amounts of Assets Presented on the Balance Sheet	(197)
Interest rate options
Assets:
Gross Amounts of Recognized Assets (Liabilities)	43,531
Cash Collateral	(31,060)
Net Amounts of Assets Presented on the Balance Sheet	$ 12,471

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 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