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Debt And Credit Agreements (Schedule Of Borrowings Under Credit Agreement At Various Indebtedness To Adjusted EBITDA Levels) (Details) | 12 Months Ended
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Dec. 31, 2014
Line of Credit Facility [Line Items] |
Credit Spread Over LIBOR | 1.75%tg_CreditSpreadOverLondonInterbankOfferedRateBasisPoints
Indebtedness-To-Adjusted EBITDA Ratio Greater Than 2.0x But Less Than Or Equal To 3.0x [Member] |
Line of Credit Facility [Line Items] |
Credit Spread Over LIBOR | 2.00%tg_CreditSpreadOverLondonInterbankOfferedRateBasisPoints / us-gaap_LineOfCreditFacilityAxis = tg_IndebtednessToAdjustedEbitdaRatioGreaterThanTwoButLessThanOrEqualToThreeMember
Commitment Fee | 0.35%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_LineOfCreditFacilityAxis = tg_IndebtednessToAdjustedEbitdaRatioGreaterThanTwoButLessThanOrEqualToThreeMember
Indebtedness-To-Adjusted EBITDA Ratio Greater Than 1.0x But Less Than Or Equal To 2.0x [Member] |
Line of Credit Facility [Line Items] |
Credit Spread Over LIBOR | 1.75%tg_CreditSpreadOverLondonInterbankOfferedRateBasisPoints / us-gaap_LineOfCreditFacilityAxis = tg_IndebtednessToAdjustedEbitdaRatioGreaterThanOneButLessThanOrEqualToTwoMember
Commitment Fee | 0.30%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_LineOfCreditFacilityAxis = tg_IndebtednessToAdjustedEbitdaRatioGreaterThanOneButLessThanOrEqualToTwoMember
Indebtedness-To-Adjusted EBITDA Ratio Less Than Or Equal To 1.0x [Member] |
Line of Credit Facility [Line Items] |
Indebtedness-to-Adjusted EBITDA Ratio | 1.0 tg_LineOfCreditFacilityCovenantTermsDebtToEbitdaRatio / us-gaap_LineOfCreditFacilityAxis = tg_IndebtednessToAdjustedEbitdaRatioLessThanOrEqualToOneMember
Credit Spread Over LIBOR | 1.50%tg_CreditSpreadOverLondonInterbankOfferedRateBasisPoints / us-gaap_LineOfCreditFacilityAxis = tg_IndebtednessToAdjustedEbitdaRatioLessThanOrEqualToOneMember
Commitment Fee | 0.25%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_LineOfCreditFacilityAxis = tg_IndebtednessToAdjustedEbitdaRatioLessThanOrEqualToOneMember
Minimum | Indebtedness-To-Adjusted EBITDA Ratio Greater Than 2.0x But Less Than Or Equal To 3.0x [Member] |
Line of Credit Facility [Line Items] |
Indebtedness-to-Adjusted EBITDA Ratio | 2.0 tg_LineOfCreditFacilityCovenantTermsDebtToEbitdaRatio / us-gaap_LineOfCreditFacilityAxis = tg_IndebtednessToAdjustedEbitdaRatioGreaterThanTwoButLessThanOrEqualToThreeMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Minimum | Indebtedness-To-Adjusted EBITDA Ratio Greater Than 1.0x But Less Than Or Equal To 2.0x [Member] |
Line of Credit Facility [Line Items] |
Indebtedness-to-Adjusted EBITDA Ratio | 1.0 tg_LineOfCreditFacilityCovenantTermsDebtToEbitdaRatio / us-gaap_LineOfCreditFacilityAxis = tg_IndebtednessToAdjustedEbitdaRatioGreaterThanOneButLessThanOrEqualToTwoMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum | Indebtedness-To-Adjusted EBITDA Ratio Greater Than 2.0x But Less Than Or Equal To 3.0x [Member] |
Line of Credit Facility [Line Items] |
Indebtedness-to-Adjusted EBITDA Ratio | 3.0 tg_LineOfCreditFacilityCovenantTermsDebtToEbitdaRatio / us-gaap_LineOfCreditFacilityAxis = tg_IndebtednessToAdjustedEbitdaRatioGreaterThanTwoButLessThanOrEqualToThreeMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Maximum | Indebtedness-To-Adjusted EBITDA Ratio Greater Than 1.0x But Less Than Or Equal To 2.0x [Member] |
Line of Credit Facility [Line Items] |
Indebtedness-to-Adjusted EBITDA Ratio | 2.0 tg_LineOfCreditFacilityCovenantTermsDebtToEbitdaRatio / us-gaap_LineOfCreditFacilityAxis = tg_IndebtednessToAdjustedEbitdaRatioGreaterThanOneButLessThanOrEqualToTwoMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition Credit spread over LIBOR basis points. + References No definition available. + Details
Name: | tg_CreditSpreadOverLondonInterbankOfferedRateBasisPoints
Namespace Prefix: | tg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line Of Credit Facility Covenant Terms Debt To Ebitda Ratio + References No definition available. + Details
Name: | tg_LineOfCreditFacilityCovenantTermsDebtToEbitdaRatio
Namespace Prefix: | tg_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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- Details
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- Details
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- Details
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