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Debt And Credit Agreements (Narrative) (Details) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Apr. 23, 2012
Line of Credit Facility [Line Items]    
Credit spread over LIBOR, basis points 1.75%tg_CreditSpreadOverLondonInterbankOfferedRateBasisPoints  
Line of credit facility, covenant terms, maximum debt to EBITDA ratio 3.0tg_LineOfCreditFacilityCovenantTermsMaximumDebtToEbitdaRatio  
Line of credit facility, covenant terms, minimum adjusted EBIT-to-interest expense ratio 2.5tg_LineOfCreditFacilityCovenantTermsMinimumAdjustedEbitToInterestExpenseRatio  
Line of credit facility, covenant terms, maximum aggregate distributions $ 100,000,000tg_LineOfCreditFacilityCovenantTermsMaximumAggregateDividends  
Line of credit facility, covenant terms, percentage of distributions to net income 50.00%tg_LineOfCreditFacilityCovenantTermsPercentageOfDividendsToNetIncome  
Line of credit facility, covenant terms, minimum shareholders' equity 320,000,000tg_LineOfCreditFacilityCovenantTermsMinimumShareholdersEquity  
Line of credit facility, covenant terms, percentage of shareholders' equity to net income 50.00%tg_LineOfCreditFacilityCovenantTermsPercentageOfShareholdersEquityToNetIncome  
Available credit under the Credit Agreement 155,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity  
Unsecured Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Line of credit facility, maximum borrowing capacity   350,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= tg_UnsecuredRevolvingCreditFacilityMember
Line of credit facility, term   5 years
Line of credit facility, option to increase additional amount   75,000,000tg_LineOfCreditFacilityAdditionalBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= tg_UnsecuredRevolvingCreditFacilityMember
Amount borrowed under the Credit Agreement   102,000,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= tg_UnsecuredRevolvingCreditFacilityMember
Previous Unsecured Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Line of credit facility, maximum borrowing capacity   $ 300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= tg_PreviousUnsecuredRevolvingCreditFacilityMember
Line of credit facility, term   4 years