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Derivative instruments: (Details) (Natural Gas Swaps, USD $)	Dec. 31, 2013 MMBTU	Dec. 31, 2012
Gas hedges
Derivative assets	$ 1,011,000
Fair values of price risk derivative liabilities		$ 1,085,000
Derivative volume activity that is expected to settle or mature each year (in MMBTUs)	4,700,000
2014
Gas hedges
Derivative volume activity that is expected to settle or mature each year (in MMBTUs)	4,000,000
2015
Gas hedges
Derivative volume activity that is expected to settle or mature each year (in MMBTUs)	700,000

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.

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- 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