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Consolidated Statements Of Shareholders' Equity (USD $) In Thousands, unless otherwise specified | Total | Common Stock | Retained Earnings | Trust for Savings Restoration Plan | Foreign Currency Translation | Gain (Loss) on Derivative Financial Instruments | Pension & Other Post-retirement Benefit Adjust.
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2014 | $ 372,029 us-gaap_StockholdersEquity | $ 24,364 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 499,300 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (1,440)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = tg_TrustForSavingRestorationPlanMember | $ (47,270)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | $ 656 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | $ (103,581)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 9,870 us-gaap_NetIncomeLoss |  | 9,870 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Foreign currency translation adjustment (net of tax benefit of $1,609) | (34,653)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  |  |  | (34,653)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |
Derivative financial instruments adjustment (net of tax benefit of $399) | (662)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax |  |  |  |  | (662)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
Amortization of prior service costs and net gains or losses (net of tax of $1,462) | 2,522 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax |  |  |  |  |  | 2,522 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Cash dividends declared ($0.09 per share) | (2,939)us-gaap_DividendsCommonStockCash |  | (2,939)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Stock-based compensation expense | 900 tg_ShareBasedCompensationExpenseValue | 900 tg_ShareBasedCompensationExpenseValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issued upon exercise of stock options & other | 1,800 tg_StockIssuedDuringPeriodForStockOptionsExercisedAndOtherMiscellaneousStockTransactions | 1,800 tg_StockIssuedDuringPeriodForStockOptionsExercisedAndOtherMiscellaneousStockTransactions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Tredegar common stock purchased by trust for savings restoration plan |  |  | 6 tg_TredegarCommonStockPurchasedByTrustForSavingsRestorationPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (6)tg_TredegarCommonStockPurchasedByTrustForSavingsRestorationPlan / us-gaap_StatementEquityComponentsAxis = tg_TrustForSavingRestorationPlanMember |  |  |
Ending Balance at Mar. 31, 2015 | $ 348,867 us-gaap_StockholdersEquity | $ 27,064 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 506,237 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (1,446)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = tg_TrustForSavingRestorationPlanMember | $ (81,923)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember | $ (6)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | $ (101,059)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember

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