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Derivative Instruments (Details 5) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Natural gas swaps
Assets:
Gross Amounts of Recognized Assets (Liabilities)	$ 815	$ 815
Gross Amounts offset on the Balance Sheet	(239)	(239)
Net Amounts of Assets (Liabilities) Presented on the Balance Sheet	576	576
Interest rate options
Assets:
Gross Amounts of Recognized Assets (Liabilities)	26,539	26,539
Cash Collateral	(13,360)	(13,360)
Net Amounts of Assets (Liabilities) Presented on the Balance Sheet	$ 13,179	$ 13,179

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