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Accumulated Other Comprehensive Income (Loss) (Schedule Of Reclassifications Of Balances Out Of Accumulated Other Comprehensive Income (Loss) Into Net Income) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Cost of sales | $ (197,488) |  | $ (175,857)
Total, before taxes | 13,281 |  | 11,869
Income tax expense (benefit) | 3,764 |  | 4,132
Total, net of tax | 4,277 |  | 2,998
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Gain (Loss) On Derivative Financial Instruments [Member] |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total, before taxes | 42 |  |
Income tax expense (benefit) | 16 |  |
Total, net of tax | 26 |  |
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Gain (Loss) On Derivative Financial Instruments [Member] | Aluminum Futures Contracts [Member] |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Cost of sales | 42 |  |
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Pension & Other Post-Retirement Benefit Adjust. [Member] |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Actuarial gain (loss) and prior service costs, before taxes | (3,649) | [1] |
Income tax expense (benefit) | (1,336) |  |
Total, net of tax | $ (2,313) |  |
[1] | This component of accumulated other comprehensive income is included in the computation of net periodic pension cost (see Note 10 for additional detail).

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- Definition Total costs related to goods produced and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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