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Derivative instruments: (Details 3) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Interest rate options
Assets:
Fair value of assets	$ 63,471,000	$ 25,783,000
Natural gas swaps
Assets:
Fair value of assets	1,011,000
Liabilities:
Fair Value of liabilities		1,085,000
Liability associated with cash collateral, which is recorded as an offset to the fair value of derivatives		1,085,000
Not designated as hedges \| Interest rate options
Assets:
Fair value of assets	63,471,000	25,783,000
Liabilities:
Liability associated with cash collateral, which is recorded as an offset to the fair value of derivatives	34,970,000	8,950,000
Not designated as hedges \| Natural gas swaps
Assets:
Fair value of assets	1,011,000
Liabilities:
Fair Value of liabilities		$ 1,085,000

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.

+ References+ Details

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or 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.

+ References+ Details