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Fair Value Measurements And Derivative Instruments Fair Value Measurements And Derivative Instruments (Schedule Of Fair Value Of Derivatives) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivatives designated as cash flow hedges:
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 350	$ 5,326
Liability Derivatives	11,023	581
Derivatives designated as cash flow hedges: | Commodity derivative contracts | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	90
Derivatives designated as cash flow hedges: | Commodity derivative contracts | Other accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	4,630
Derivatives designated as cash flow hedges: | Commodity derivative contracts | Other long-term assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	260
Derivatives designated as cash flow hedges: | Commodity derivative contracts | Other long-term obligations
Derivatives, Fair Value [Line Items]
Liability Derivatives	6,393
Derivatives not designated as hedges: | Foreign currency derivatives | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	9
Derivatives not designated as hedges: | Foreign currency derivatives | Other current liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 43	$ 90

X

- Definition

Fair value, before 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 elected not to be offset. Excludes assets not subject to a master netting arrangement.

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+ References

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