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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, 2020	Dec. 31, 2019
Derivatives designated as cash flow hedges:
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 581	$ 3,410
Liability Derivatives	13,769	4,199
Derivatives designated as cash flow hedges: | Commodity derivative contracts | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	518	104
Derivatives designated as cash flow hedges: | Commodity derivative contracts | Other accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	888	1,872
Derivatives designated as cash flow hedges: | Commodity derivative contracts | Other long-term assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	63	369
Derivatives designated as cash flow hedges: | Commodity derivative contracts | Other long-term obligations
Derivatives, Fair Value [Line Items]
Liability Derivatives	1,898	2,255
Derivatives designated as cash flow hedges: | Interest rate swap | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	253
Derivatives designated as cash flow hedges: | Interest rate swap | Other accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	4,080	0
Derivatives designated as cash flow hedges: | Interest rate swap | Other long-term assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	2,684
Derivatives designated as cash flow hedges: | Interest rate swap | Other long-term obligations
Derivatives, Fair Value [Line Items]
Liability Derivatives	6,903	72
Derivatives not designated as hedges:
Derivatives, Fair Value [Line Items]
Asset Derivatives	6	615
Liability Derivatives	1,063	81
Derivatives not designated as hedges: | Commodity derivative contracts | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives		376
Derivatives not designated as hedges: | Commodity derivative contracts | Other accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives		0
Derivatives not designated as hedges: | Interest rate swap | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	0
Derivatives not designated as hedges: | Interest rate swap | Other accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	952
Derivatives not designated as hedges: | Foreign currency derivatives | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	6	239
Derivatives not designated as hedges: | Foreign currency derivatives | Other accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 111	$ 81

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.

+ References

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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