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Summary Of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accounting Policies [Abstract] |  |  |
Schedule Of Diluted Earnings Per Share Computed Using Weighted Average Common And Potentially Dilutive Common Equivalent Shares Outstanding | Diluted earnings per share is computed using the weighted average common and potentially dilutive common equivalent shares outstanding, determined as follows:
| 2017 |  | 2016 |  | 2015
Weighted average shares outstanding used to compute basic earnings per share | 32,945,961 |  |  | 32,761,793 |  |  | 32,578,116 |
Incremental shares attributable to stock options and restricted stock | 5,327 |  |  | 13,279 |  |  | — |
Shares used to compute diluted earnings per share | 32,951,288 |  |  | 32,775,072 |  |  | 32,578,116 |
Schedule Of Assumptions For Valuing Stock Options Granted | The assumptions used in this model for valuing Tredegar stock options granted in 2017 (no grants in 2015 and 2016) were as follows:
| 2017
Dividend yield | 1.9 | %
Weighted average volatility percentage | 38.3 | %
Weighted average risk-free interest rate | 1.8 | %
Holding period (years): |
Officers | 5 |
Management | 5 |
Weighted average exercise price at date of grant (also weighted average market price at date of grant): |
Officers | $ | 15.65 |
Management | 15.65 |
Schedule Of Stock Options Granted And Related Estimated Fair Value At Date Of Grant | Tredegar stock options granted during 2017 (no grants in 2015 and 2016), and related estimated fair value at the date of grant, are as follows:
| 2017
Stock options granted (number of shares): |
Officers | 151,992 |
Management | 57,559 |
Total | 209,551 |
Estimated weighted average fair value of options per share at date of grant: |
Officers | $ | 4.69 |
Management | 4.69 |
Total estimated fair value of stock options granted (in thousands) | $ | 983 |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following table summarizes the after-tax changes in accumulated other comprehensive income (loss) for the year ended December 31, 2017:
(In thousands) | Foreign currency translation adjustment |  | Gain (loss) on derivative financial instruments |  | Pension and other post-retirement benefit adjustments |  | Total
Beginning balance, January 1, 2017 | $ | (93,970 | ) |  | $ | 863 |  |  | $ | (90,127 | ) |  | $ | (183,234 | )
Other comprehensive income (loss) before reclassifications | 7,792 |  |  | 538 |  |  | (8,634 | ) |  | (304 | )
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | (942 | ) |  | 7,811 |  |  | 6,869 |
Net other comprehensive income (loss) - current period | 7,792 |  |  | (404 | ) |  | (823 | ) |  | 6,565 |
Ending balance, December 31, 2017 | $ | (86,178 | ) |  | $ | 459 |  |  | $ | (90,950 | ) |  | $ | (176,669 | )
The following table summarizes the after-tax changes in accumulated other comprehensive income (loss) for the year ended December 31, 2016:
(In thousands) | Foreign currency translation adjustment |  | Gain (loss) on derivative financial instruments |  | Pension and other post-retirement benefit adjustments |  | Total
Beginning balance, January 1, 2016 | $ | (112,807 | ) |  | $ | (373 | ) |  | $ | (95,539 | ) |  | $ | (208,719 | )
Other comprehensive income (loss) before reclassifications | 18,837 |  |  | 247 |  |  | (3,288 | ) |  | 15,796 |
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | 989 |  |  | 8,700 |  |  | 9,689 |
Net other comprehensive income (loss) - current period | 18,837 |  |  | 1,236 |  |  | 5,412 |  |  | 25,485 |
Ending balance, December 31, 2016 | $ | (93,970 | ) |  | $ | 863 |  |  | $ | (90,127 | ) |  | $ | (183,234 | )
Reclassification out of Accumulated Other Comprehensive Income | Reclassifications of balances out of accumulated other comprehensive income (loss) into net income during 2017 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 | $ | 1,210 |  |  | Cost of goods sold
Foreign currency forward contracts, before taxes | 62 |  |  | Cost of goods sold
Foreign currency forward contracts, before taxes | (43 | ) |  | Selling, general and administrative
Total, before taxes | 1,229 |  |  |
Income tax expense (benefit) | 287 |  |  | Income taxes
Total, net of tax | $ | 942 |  |  |
Amortization of pension and other post-retirement benefits: |  |  |
Actuarial gain (loss) and prior service costs, before taxes | $ | (12,045 | ) |  | (a)
Income tax expense (benefit) | (4,234 | ) |  | Income taxes
Total, net of tax | $ | (7,811 | ) |  |
(a) This component of accumulated other comprehensive income is included in the computation of net periodic pension cost (see Note 13 for additional detail).
| Reclassifications of balances out of accumulated other comprehensive income (loss) into net income during 2016 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
Gain (loss) on derivative financial instruments: |  |  |
Aluminum future contracts, before taxes | $ | (1,630 | ) |  | Cost of goods sold
Foreign currency forward contracts, before taxes | 62 |  |  | Cost of goods sold
Total, before taxes | (1,568 | ) |  |
Income tax expense (benefit) | (579 | ) |  | Income taxes
Total, net of tax | $ | (989 | ) |  |
Amortization of pension and other post-retirement benefits: |  |  |
Actuarial gain (loss) and prior service costs, before taxes | $ | (13,098 | ) |  | (a)
Income tax expense (benefit) | (4,398 | ) |  | Income taxes
Total, net of tax | $ | (8,700 | ) |  |
(a) This component of accumulated other comprehensive income is included in the computation of net periodic pension cost (see Note 13 for additional detail).
| Reclassifications of balances out of accumulated other comprehensive income (loss) into net income during 2015 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
Gain (loss) on derivative financial instruments: |  |  |
Aluminum future contracts, before taxes | $ | (3,538 | ) |  | Cost of goods sold
Foreign currency forward contracts, before taxes | 62 |  |  | Cost of goods sold
Total, before taxes | (3,476 | ) |  |
Income tax expense (benefit) | (1,284 | ) |  | Income taxes
Total, net of tax | $ | (2,192 | ) |  |
Amortization of pension and other post-retirement benefits: |  |  |
Actuarial gain (loss) and prior service costs, before taxes | $ | (16,041 | ) |  | (a)
Income tax expense (benefit) | (5,823 | ) |  | Income taxes
Total, net of tax | $ | (10,218 | ) |  |
(a) This component of accumulated other comprehensive income is included in the computation of net periodic pension cost (see Note 13 for additional detail).

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