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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
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock options granted (number of shares):
Stock options granted (number of shares)	181,476us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	184,700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	182,100us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
Estimated weighted average fair value of options per share at date of grant:
Total estimated fair value of stock options granted	$ 1,521tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEstimatedFairValueOfStockOptionsGranted	$ 1,850tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEstimatedFairValueOfStockOptionsGranted	$ 1,449tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEstimatedFairValueOfStockOptionsGranted
Officers
Stock options granted (number of shares):
Stock options granted (number of shares)	87,820us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember	94,400us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember	99,600us-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	$ 9.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember	$ 10.37us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember	$ 8.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember
Management
Stock options granted (number of shares):
Stock options granted (number of shares)	93,656us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_TitleOfIndividualAxis = tg_OtherManagementMember	90,300us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_TitleOfIndividualAxis = tg_OtherManagementMember	82,500us-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	$ 7.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_TitleOfIndividualAxis = tg_OtherManagementMember	$ 9.65us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_TitleOfIndividualAxis = tg_OtherManagementMember	$ 7.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_TitleOfIndividualAxis = tg_OtherManagementMember

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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)

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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