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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 | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (200,238) | $ (180,898) | $ (200,238) | $ (180,898) | $ (197,651) | $ (179,987)
Selling, general and administrative | 20,420 | 19,154 | 61,654 | 56,399 |  |
Income before income taxes | 22,918 | (15,229) | 31,616 | (68,021) |  |
Income taxes from continuing operations | 5,942 | (177) | 8,308 | (10,550) |  |
Net income (loss) | (65,213) | 17,133 | (76,339) | 51,395 |  |
Foreign Currency Translation |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (111,739) | (103,231) | (111,739) | (103,231) | (100,663) | (96,940)
Gain (Loss) on Derivative Financial Instruments |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (1,611) | (2,457) | (1,611) | (2,457) | (1,307) | (1,601)
Pension & Other Post-retirement Benefit Adjustment |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (86,888) | (75,210) | (86,888) | (75,210) | $ (95,681) | $ (81,446)
Reclassification Out Of Accumulated Other Comprehensive Income | Gain (Loss) on Derivative Financial Instruments |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Income before income taxes | 2,327 | 902 | 7,079 | 2,654 |  |
Income taxes from continuing operations | 496 | 179 | 1,523 | 445 |  |
Net income (loss) | (1,831) | (723) | (5,556) | (2,209) |  |
Reclassification Out Of Accumulated Other Comprehensive Income | Gain (Loss) on Derivative Financial Instruments | Aluminum Futures Contracts |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Cost of goods sold | (575) | (816) | (2,766) | (2,039) |  |
Reclassification Out Of Accumulated Other Comprehensive Income | Pension & Other Post-retirement Benefit Adjustment |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Actuarial gain (loss) and prior service costs, before taxes | (3,767) | (2,672) | (11,300) | (8,014) |  |
Income taxes from continuing operations | 836 | 593 | 2,507 | 1,778 |  |
Net income (loss) | (2,931) | (2,079) | (8,793) | (6,236) |  |
Selling, General and Administrative Expenses [Member] | Reclassification Out Of Accumulated Other Comprehensive Income | Gain (Loss) on Derivative Financial Instruments | Foreign Currency Forward Contracts |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Cost of goods sold |  | (101) |  | (661) |  |
Selling, general and administrative | (1,767) |  | (4,359) |  |  |
Cost of Sales [Member] | Reclassification Out Of Accumulated Other Comprehensive Income | Gain (Loss) on Derivative Financial Instruments | Foreign Currency Forward Contracts |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Cost of goods sold | $ 15 | $ 15 | $ 46 | $ 46 |  |

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