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Disclosures about Derivative Instruments and Hedging Activities (Details 3) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Natural gas swaps
Liabilities:
Fair Value of liabilities	$ 13,000	$ 7,220,000
Interest rate options
Assets:
Fair value of assets	29,921,000	69,446,000
Designated as hedges \| Natural gas swaps
Liabilities:
Fair Value of liabilities	634,000
Assets:
Fair value of assets	621,000
Not designated as hedges \| Interest rate options
Assets:
Fair value of assets	$ 29,921,000

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.

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- Definition

Fair value of derivative liability, 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