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Consolidated Statements Of Shareholders' Equity - 9 months ended Sep. 30, 2018 - USD ($) $ in Thousands | Total | Common Stock | Retained Earnings | Trust for Savings Restoration Plan | Foreign Currency Translation | Gain (Loss) on Derivative Financial Instruments | Pension & Other Post-retirement Benefit Adjustment
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2017 | $ 343,780 | $ 34,747 | $ 487,230 | $ (1,528) | $ (86,178) | $ 459 | $ (90,950)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | (1,314) |  | (1,314) |  |  |  |
Foreign currency translation adjustment (net of tax of $0) | (11,571) |  |  |  | (11,571) |  |
Derivative financial instruments adjustment (net of tax benefit of $316) | (2,891) |  |  |  |  | (2,891) |
Amortization of prior service costs and net gains or losses (net of tax of $2,312) | 7,926 |  |  |  |  |  | 7,926
Cash dividends declared ($0.33 per share) | (10,943) |  | (10,943) |  |  |  |
Stock-based compensation expense | 2,780 | 2,780 |  |  |  |  |
Issued upon exercise of stock options & other | 1,004 | 1,004 |  |  |  |  |
Tredegar common stock purchased by trust for savings restoration plan |  |  | 24 | (24) |  |  |
Ending Balance at Sep. 30, 2018 | $ 328,771 | $ 38,531 | $ 474,997 | $ (1,552) | $ (97,749) | $ (2,432) | $ (83,024)

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