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Derivative Financial Instruments (Summary Of Location And Fair Value Of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 2,608
Derivative Asset, Fair Value, Gross Liability		$ (1,255)
Aluminum Futures Contracts
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	7,143	1,966
Derivatives Designated As Hedging Instruments [Member] | Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives: Fair Value	0	1,255
Derivatives Designated As Hedging Instruments [Member] | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	2,127	0
Derivatives Designated As Hedging Instruments [Member] | Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	481	0
Derivatives Designated As Hedging Instruments [Member] | Aluminum Futures Contracts | Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives: Fair Value	(43)	(119)
Derivatives Designated As Hedging Instruments [Member] | Aluminum Futures Contracts | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	6,665	2,085
Derivatives Designated As Hedging Instruments [Member] | Aluminum Futures Contracts | Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 521	$ 0

X

- Definition

Fair value of liability associated with 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.

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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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