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Debt And Credit Agreements (Schedule Of Borrowings Under Credit Agreement At Various Indebtedness To Adjusted EBITDA Levels) (Details) | 6 Months Ended
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Jun. 30, 2012
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 | 200
Commitment Fee | 35.00%
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 | 175
Commitment Fee | 30.00%
Indebtedness-To-Adjusted EBITDA Ratio Less Than Or Equal To 1.0x [Member] |
Line of Credit Facility [Line Items] |
Indebtdedness to adjusted EBITDA ratio | 1.0
Credit Spread Over LIBOR | 150
Commitment Fee | 25.00%
Maximum [Member] | Indebtedness-To-Adjusted EBITDA Ratio Greater Than 2.0x But Less Than Or Equal To 3.0x [Member] |
Line of Credit Facility [Line Items] |
Indebtdedness to adjusted EBITDA ratio | 3.0
Maximum [Member] | Indebtedness-To-Adjusted EBITDA Ratio Greater Than 1.0x But Less Than Or Equal To 2.0x [Member] |
Line of Credit Facility [Line Items] |
Indebtdedness to adjusted EBITDA ratio | 2.0
Minimum [Member] | Indebtedness-To-Adjusted EBITDA Ratio Greater Than 2.0x But Less Than Or Equal To 3.0x [Member] |
Line of Credit Facility [Line Items] |
Indebtdedness to adjusted EBITDA ratio | 2.0
Minimum [Member] | Indebtedness-To-Adjusted EBITDA Ratio Greater Than 1.0x But Less Than Or Equal To 2.0x [Member] |
Line of Credit Facility [Line Items] |
Indebtdedness to adjusted EBITDA ratio | 1.0

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

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- Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration