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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |
Schedule Of After-Tax Changes In Accumulated Other Comprehensive Income (Loss) | The following table summarizes the after-tax changes in accumulated other comprehensive income (loss) for the three months ended March 31, 2021:
(In thousands) | Foreign currency translation adjustment |  | Gain (loss) on derivative financial instruments |  | Pension and other post-retirement benefit adjustments |  | Total
Beginning balance, January 1, 2021 | $ | (84,149) |  |  | $ | 2,264 |  |  | $ | (96,519) |  |  | $ | (178,404) |
Other comprehensive income (loss) before reclassifications | (2,648) |  |  | 273 |  |  | — |  |  | (2,375) |
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | (509) |  |  | 3,319 |  |  | 2,810 |
Net other comprehensive income (loss) - current period | (2,648) |  |  | (236) |  |  | 3,319 |  |  | 435 |
Ending balance, March 31, 2021 | $ | (86,797) |  |  | $ | 2,028 |  |  | $ | (93,200) |  |  | $ | (177,969) |
| The following table summarizes the after-tax changes in accumulated other comprehensive income (loss) for the three months ended March 31, 2020:
(In thousands) | Foreign currency translation adjustment |  | Gain (loss) on derivative financial instruments |  | Pension and other post-retirement benefit adjustments |  | Total
Beginning balance, January 1, 2020 | $ | (100,663) |  |  | $ | (1,307) |  |  | $ | (95,681) |  |  | $ | (197,651) |
Other comprehensive income (loss) before reclassifications | (11,529) |  |  | (4,888) |  |  | — |  |  | (16,417) |
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | 1,113 |  |  | 2,931 |  |  | 4,044 |
Net other comprehensive income (loss) - current period | (11,529) |  |  | (3,775) |  |  | 2,931 |  |  | (12,373) |
Ending balance, March 31, 2020 | $ | (112,192) |  |  | $ | (5,082) |  |  | $ | (92,750) |  |  | $ | (210,024) |
Schedule Of Reclassifications Of Balances Out Of Accumulated Other Comprehensive Income (Loss) Into Net Income | Reclassifications of balances out of accumulated other comprehensive income (loss) into net income (loss) for the three months ended March 31, 2021 are summarized as follows:
(In thousands) | Amount reclassified from other comprehensive income (loss) |  | Location of gain (loss) reclassified from accumulated other comprehensive income (loss) to net income (loss)
Gain (loss) on derivative financial instruments: |  |  |
Aluminum future contracts, before taxes | $ | 640 |  |  | Cost of sales
Foreign currency forward contracts, before taxes | (2) |  |  | Selling, general & administrative
Foreign currency forward contracts, before taxes | 17 |  |  | Cost of sales
Total, before taxes | 655 |  |  |
Income tax expense (benefit) | 146 |  |  | Income tax expense (benefit)
Total, net of tax | $ | 509 |  |  |
Amortization of pension and other post-retirement benefits: |  |  |
Actuarial gain (loss) and prior service costs, before taxes | $ | (4,243) |  |  | (a)
Income tax expense (benefit) | (924) |  |  | Income tax expense (benefit)
Total, net of tax | $ | (3,319) |  |  |
(a) This component of accumulated other comprehensive income (loss) is included in the computation of net periodic pension cost (see Note 9 for additional detail). | Reclassifications of balances out of accumulated other comprehensive income (loss) into net income for the three months ended March 31, 2020 are summarized as follows:
(In thousands) | Amount reclassified from other comprehensive income (loss) |  | Location of gain (loss) reclassified from accumulated other comprehensive income (loss) to net income (loss)
Gain (loss) on derivative financial instruments: |  |  |
Aluminum future contracts, before taxes | $ | (640) |  |  | Cost of sales
Foreign currency forward contracts, before taxes | (794) |  |  | Selling, general & administrative
Foreign currency forward contracts, before taxes | 15 |  |  | Cost of sales
Total, before taxes | (1,419) |  |  |
Income tax expense (benefit) | (306) |  |  | Income tax expense (benefit)
Total, net of tax | $ | (1,113) |  |  |
Amortization of pension and other post-retirement benefits: |  |  |
Actuarial gain (loss) and prior service costs, before taxes | $ | (3,767) |  |  | (a)
Income tax expense (benefit) | (836) |  |  | Income tax expense (benefit)
Total, net of tax | $ | (2,931) |  |  |
(a) This component of accumulated other comprehensive income (loss) is included in the computation of net periodic pension cost (see Note 9 for additional detail).

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