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Selected Quarterly Financial Data (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Benefit Expense Valuation Allowance Adj Capital Loss Carryforwards | $ 4,800,000 tg_DeferredTaxBenefitExpenseValuationAllowanceAdjCapitalLossCarryforwards |  |  |  |  |  |  |  | $ 4,900,000 tg_DeferredTaxBenefitExpenseValuationAllowanceAdjCapitalLossCarryforwards |  |  |  |  |
Sales | 239,219,000 us-gaap_SalesRevenueGoodsNet | 240,429,000 us-gaap_SalesRevenueGoodsNet | 236,965,000 us-gaap_SalesRevenueGoodsNet | 235,213,000 us-gaap_SalesRevenueGoodsNet | 231,096,000 us-gaap_SalesRevenueGoodsNet | 243,194,000 us-gaap_SalesRevenueGoodsNet | 243,530,000 us-gaap_SalesRevenueGoodsNet | 241,526,000 us-gaap_SalesRevenueGoodsNet | 951,826,000 us-gaap_SalesRevenueGoodsNet |  | 959,346,000 us-gaap_SalesRevenueGoodsNet |  | 882,188,000 us-gaap_SalesRevenueGoodsNet |
Gross profit | 34,109,000 us-gaap_GrossProfit | 34,582,000 us-gaap_GrossProfit | 38,480,000 us-gaap_GrossProfit | 37,749,000 us-gaap_GrossProfit | 34,417,000 us-gaap_GrossProfit | 37,253,000 us-gaap_GrossProfit | 37,540,000 us-gaap_GrossProfit | 36,836,000 us-gaap_GrossProfit |  |  |  |  |  |
Income from continuing operations | 13,054,000 us-gaap_IncomeLossFromContinuingOperations | 10,745,000 us-gaap_IncomeLossFromContinuingOperations | 3,752,000 us-gaap_IncomeLossFromContinuingOperations | 8,479,000 us-gaap_IncomeLossFromContinuingOperations | 9,402,000 us-gaap_IncomeLossFromContinuingOperations | 7,428,000 us-gaap_IncomeLossFromContinuingOperations | 9,590,000 us-gaap_IncomeLossFromContinuingOperations | 9,517,000 us-gaap_IncomeLossFromContinuingOperations | 36,029,000 us-gaap_IncomeLossFromContinuingOperations |  | 35,937,000 us-gaap_IncomeLossFromContinuingOperations |  | 43,185,000 us-gaap_IncomeLossFromContinuingOperations |
Income (loss) from discontinued operations | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 850,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (450,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (8,300,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (5,240,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 850,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | [1] | (13,990,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | [1] | (14,934,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | [1]
Net income (loss) | 13,054,000 us-gaap_NetIncomeLoss | 11,595,000 us-gaap_NetIncomeLoss | 3,752,000 us-gaap_NetIncomeLoss | 8,479,000 us-gaap_NetIncomeLoss | 9,402,000 us-gaap_NetIncomeLoss | 6,978,000 us-gaap_NetIncomeLoss | 1,290,000 us-gaap_NetIncomeLoss | 4,277,000 us-gaap_NetIncomeLoss | 36,879,000 us-gaap_NetIncomeLoss |  | 21,947,000 us-gaap_NetIncomeLoss |  | 28,251,000 us-gaap_NetIncomeLoss |
Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ 0.40 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.33 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.12 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.26 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.29 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.23 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.30 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.30 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.12 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |  | $ 1.12 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |  | $ 1.35 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |
Discontinued operations | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.03 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |  | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.26)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.16)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |  | $ (0.44)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |  | $ (0.47)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |
Net income | $ 0.40 us-gaap_EarningsPerShareBasic | $ 0.36 us-gaap_EarningsPerShareBasic | $ 0.12 us-gaap_EarningsPerShareBasic | $ 0.26 us-gaap_EarningsPerShareBasic | $ 0.29 us-gaap_EarningsPerShareBasic | $ 0.22 us-gaap_EarningsPerShareBasic | $ 0.04 us-gaap_EarningsPerShareBasic | $ 0.14 us-gaap_EarningsPerShareBasic | $ 1.14 us-gaap_EarningsPerShareBasic |  | $ 0.68 us-gaap_EarningsPerShareBasic |  | $ 0.88 us-gaap_EarningsPerShareBasic |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in usd per share) | $ 0.40 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.33 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.11 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.26 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.29 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.23 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.29 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.29 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.11 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |  | $ 1.10 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |  | $ 1.34 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |
Discontinued operations (in usd per share) | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.03 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |  | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.25)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.16)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |  | $ (0.43)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |  | $ (0.46)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |
Net income (in usd per share) | $ 0.40 us-gaap_EarningsPerShareDiluted | $ 0.36 us-gaap_EarningsPerShareDiluted | $ 0.11 us-gaap_EarningsPerShareDiluted | $ 0.26 us-gaap_EarningsPerShareDiluted | $ 0.29 us-gaap_EarningsPerShareDiluted | $ 0.21 us-gaap_EarningsPerShareDiluted | $ 0.04 us-gaap_EarningsPerShareDiluted | $ 0.13 us-gaap_EarningsPerShareDiluted | $ 1.13 us-gaap_EarningsPerShareDiluted |  | $ 0.67 us-gaap_EarningsPerShareDiluted |  | $ 0.88 us-gaap_EarningsPerShareDiluted |
Shares used to compute earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares used to compute earnings (loss) per share, Basic (in shares) | 32,335,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 32,319,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 32,312,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 32,242,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 32,222,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 32,201,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 32,187,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 32,076,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 32,302,108 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 32,171,751 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 32,032,343 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Shares used to compute earnings (loss) per share, Diluted (in shares) | 32,449,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 32,507,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 32,641,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 32,621,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 32,622,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 32,658,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 32,635,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 32,480,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 32,553,854 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 32,599,279 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 32,192,576 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Deferred Tax Benefit Expense Unremitted Earnings FCTA |  |  |  |  |  |  |  |  | $ 2,200,000 tg_DeferredTaxBenefitExpenseUnremittedEarningsFCTA |  |  |  |  |
[1] | See Notes 1, 3, 4 and 18 for more information on losses associated with plant shutdowns, asset impairments and restructurings, unusual items, gains or losses from sale of assets, gains or losses on an investment accounted for under the fair value method and other items.

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