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Summary Of Significant Accounting Policies (Schedule Of Stock Options Granted And Related Estimated Fair Value At Date Of Grant) (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
Stock options granted (number of shares): |  |  |
Stock options granted (number of shares) | 181,476 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod | 184,700 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod | 182,100 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
Estimated weighted average fair value of options per share at date of grant: |  |  |
Total estimated fair value of stock options granted | $ 1,521 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEstimatedFairValueOfStockOptionsGranted | $ 1,850 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEstimatedFairValueOfStockOptionsGranted | $ 1,449 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEstimatedFairValueOfStockOptionsGranted
Officers |  |  |
Stock options granted (number of shares): |  |  |
Stock options granted (number of shares) | 87,820 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember | 94,400 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember | 99,600 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember
Estimated weighted average fair value of options per share at date of grant: |  |  |
Estimated weighted average fair value of options per share at date of grant | $ 9.21 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember | $ 10.37 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember | $ 8.07 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember
Management |  |  |
Stock options granted (number of shares): |  |  |
Stock options granted (number of shares) | 93,656 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_TitleOfIndividualAxis = tg_OtherManagementMember | 90,300 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_TitleOfIndividualAxis = tg_OtherManagementMember | 82,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_TitleOfIndividualAxis = tg_OtherManagementMember
Estimated weighted average fair value of options per share at date of grant: |  |  |
Estimated weighted average fair value of options per share at date of grant | $ 7.60 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_TitleOfIndividualAxis = tg_OtherManagementMember | $ 9.65 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_TitleOfIndividualAxis = tg_OtherManagementMember | $ 7.31 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_TitleOfIndividualAxis = tg_OtherManagementMember

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- Definition Share based compensation arrangement by share based payment award estimated fair value of stock options granted + References No definition available. + Details
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- Definition Net number of share options (or share units) granted during the 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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