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Financial Instruments and Concentrations of Risk (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012 Other Current Assets [Member]	Dec. 31, 2012 Other Current Liabilities [Member]	Dec. 31, 2013 Commodity Contract [Member] Other Current Assets [Member]	Dec. 31, 2013 Commodity Contract [Member] Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	$ 0		$ 0
Derivative Liability		$ 1,034		$ 60

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.

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