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Stock Option And Stock Award Plans (Summary Of Stock Options Outstanding) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Number of Options |  |  |
Number of Options, Outstanding, Beginning Balance | 1,046,800 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 1,076,700 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 1,121,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Number of Options, Granted | 181,476 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod | 184,700 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod | 182,100 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
Number of Options, Forfeited and Expired | (22,581)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod | (34,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod | (50,300)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
Number of Options, Exercised | (41,575)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | (180,600)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | (176,600)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Number of Options, Outstanding, Ending Balance | 1,164,120 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 1,046,800 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 1,076,700 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Weighted Average |  |  |
Weighted Average Option Exercise Price/Share, Outstanding, Beginning Balance | $ 19.06 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 17.81 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 17.40 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Weighted Average Option Exercise Price/Share, Granted | $ 22.41 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice | $ 24.97 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice | $ 19.34 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Weighted Average Option Exercise Price/Share, Forfeited and Expired | $ 21.42 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice | $ 21.10 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice | $ 19.34 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
Weighted Average Option Exercise Price/Share, Exercised | $ 17.55 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice | $ 17.32 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice | $ 16.33 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Weighted Average Option Exercise Price/Share, Outstanding, Ending Balance | $ 19.59 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 19.06 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 17.81 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Minimum |  |  |
Option Exercise Price/Share Range |  |  |
Exercise Price, Outstanding, Beginning Balance | $ 14.06 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 14.06 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 14.06 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember
Exercise Price, Granted | $ 19.84 tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 24.84 tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 18.51 tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember
Exercise Price, Forfeited and Expired | $ 15.8 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 15.11 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 15.8 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember
Exercise Price, Exercised | $ 15.8 tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 14.27 tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 14.72 tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember
Exercise Price, Outstanding, Ending Balance | $ 14.06 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 14.06 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 14.06 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum |  |  |
Option Exercise Price/Share Range |  |  |
Exercise Price, Outstanding, Beginning Balance | $ 30.01 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 19.84 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 19.84 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember
Exercise Price, Granted | $ 22.49 tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 30.01 tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 19.4 tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember
Exercise Price, Forfeited and Expired | $ 24.84 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 24.84 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 19.84 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember
Exercise Price, Exercised | $ 19.84 tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 19.84 tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 18.12 tg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember
Exercise Price, Outstanding, Ending Balance | $ 30.01 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 30.01 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 19.84 tg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition Share Based Compensation Arrangement By Share Based Payment Award, Options, Forfeitures And Expirations In Period, Exercise Price + References No definition available. + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option 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)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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