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Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues and other items:
Sales	$ 234,171us-gaap_SalesRevenueGoodsNet	$ 235,213us-gaap_SalesRevenueGoodsNet
Other income (expense), net	108us-gaap_OtherNonoperatingIncomeExpense	(94)us-gaap_OtherNonoperatingIncomeExpense
Total revenues, net of other expenses	234,279tg_TotalRevenuesNetOfOtherExpenses	235,119tg_TotalRevenuesNetOfOtherExpenses
Costs and expenses:
Cost of goods sold	189,431us-gaap_CostOfGoodsSold	190,694us-gaap_CostOfGoodsSold
Freight	7,325us-gaap_ShippingHandlingAndTransportationCosts	6,770us-gaap_ShippingHandlingAndTransportationCosts
Selling, general and administrative	17,073us-gaap_SellingGeneralAndAdministrativeExpense	18,319us-gaap_SellingGeneralAndAdministrativeExpense
Research and development	3,885us-gaap_ResearchAndDevelopmentExpense	2,979us-gaap_ResearchAndDevelopmentExpense
Amortization of intangibles	1,083us-gaap_AmortizationOfIntangibleAssets	1,395us-gaap_AmortizationOfIntangibleAssets
Interest expense	885us-gaap_InterestAndDebtExpense	630us-gaap_InterestAndDebtExpense
Asset impairments and costs associated with exit and disposal activities, net of adjustments	(52)tg_AssetImpairmentAndCostsAssociatedWithExitAndDisposalActivities	1,245tg_AssetImpairmentAndCostsAssociatedWithExitAndDisposalActivities
Total	219,630us-gaap_CostsAndExpenses	222,032us-gaap_CostsAndExpenses
Income before income taxes	14,649us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	13,087us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income taxes	4,779us-gaap_IncomeTaxExpenseBenefit	4,608us-gaap_IncomeTaxExpenseBenefit
Net income	$ 9,870us-gaap_NetIncomeLoss	$ 8,479us-gaap_NetIncomeLoss
Basic
Basic	$ 0.30us-gaap_EarningsPerShareBasic	$ 0.26us-gaap_EarningsPerShareBasic
Diluted
Diluted	$ 0.30us-gaap_EarningsPerShareDiluted	$ 0.26us-gaap_EarningsPerShareDiluted
Shares used to compute earnings per share:
Basic	32,482us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	32,242us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted	32,628us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	32,621us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Dividends per share	$ 0.09us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.07us-gaap_CommonStockDividendsPerShareCashPaid

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