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Stock Option And Stock Award Plans (Summary Of Additional Information On Non-Vested Restricted Stock Outstanding) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] |  |  |
Grant Date Fair Value, Vested | $ (700)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue | $ (1,700)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue | $ (2,100)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Number of Shares, Outstanding, Beginning Balance | 157,850 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | 143,900 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | 126,150 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember
Number of Shares, Granted | 95,707 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | 93,425 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | 94,949 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember
Number of Shares, Vested | (54,921)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | (58,175)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | (60,357)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember
Number of Shares, Forfeited | (10,578)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | (21,300)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | (16,842)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember
Number of Shares, Outstanding, Ending Balance | 188,058 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | 157,850 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | 143,900 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember
Wgtd. Ave. Grant Date Fair Value/Sh., Beginning Balance | $ 22.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | $ 18.82 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | $ 18.25 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember
Wgtd. Ave. Grant Date Fair Value/Sh., Granted | $ 22.18 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | $ 25.45 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | $ 19.06 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember
Wgtd. Ave. Grant Date Fair Value/Sh., Vested | $ 20.73 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | $ 20.15 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | $ 18.01 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember
Wgtd. Ave. Grant Date Fair Value/Sh., Forfeited | $ 21.76 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | $ 20.70 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | $ 18.82 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember
Wgtd. Ave. Grant Date Fair Value/Sh., Ending Balance | $ 22.48 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | $ 22.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | $ 18.82 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] |  |  |
Grant Date Fair Value, Outstanding, Beginning Balance | 3,473 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTotalFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | 2,708 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTotalFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | 2,302 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTotalFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember
Grant Date Fair Value, Granted | 2,123 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | 2,378 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | 1,810 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember
Grant Date Fair Value, Vested | (1,139)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | (1,172)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | (1,087)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember
Grant Date Fair Value, Forfeited | (230)tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodTotalFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | (441)tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodTotalFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | (317)tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodTotalFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember
Grant Date Fair Value, Outstanding, Ending Balance | 4,227 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTotalFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | 3,473 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTotalFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember | 2,708 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTotalFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember
Maximum Non-Vested Restricted Stock Units Issuable Upon Satisfaction Of Certain Performance Criteria |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Number of Shares, Outstanding, Beginning Balance | 132,300 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | 91,800 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | 85,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember
Number of Shares, Granted | 59,675 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | 77,200 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | 87,200 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember
Number of Shares, Vested | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember
Number of Shares, Forfeited | (62,262)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | (36,700)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | (80,400)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember
Number of Shares, Outstanding, Ending Balance | 129,713 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | 132,300 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | 91,800 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember
Wgtd. Ave. Grant Date Fair Value/Sh., Beginning Balance | $ 23.81 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | $ 18.85 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | $ 19.35 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember
Wgtd. Ave. Grant Date Fair Value/Sh., Granted | $ 21.54 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | $ 27.82 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | $ 18.79 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember
Wgtd. Ave. Grant Date Fair Value/Sh., Vested | $ 0.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | $ 0.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | $ 0.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember
Wgtd. Ave. Grant Date Fair Value/Sh., Forfeited | $ 19.18 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | $ 19.83 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | $ 19.31 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember
Wgtd. Ave. Grant Date Fair Value/Sh., Ending Balance | $ 24.99 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | $ 23.81 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | $ 18.85 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] |  |  |
Grant Date Fair Value, Outstanding, Beginning Balance | 3,150 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTotalFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | 1,730 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTotalFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | 1,645 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTotalFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember
Grant Date Fair Value, Granted | 1,285 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | 2,148 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | 1,638 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember
Grant Date Fair Value, Vested | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember
Grant Date Fair Value, Forfeited | (1,194)tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodTotalFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | (728)tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodTotalFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | (1,553)tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodTotalFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember
Grant Date Fair Value, Outstanding, Ending Balance | $ 3,241 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTotalFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | $ 3,150 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTotalFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember | $ 1,730 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTotalFairValue / us-gaap_PlanNameAxis = tg_MaximumNonVestedRestrictedStockUnitsIssuableUponSatisfactionOfCertainPerformanceCriteriaMember

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period Total Fair Value + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Granted In Period Total Fair Value + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments, Other Than Options, Outstanding, Total Fair Value + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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