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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, 2022
Indebtedness To Adjusted Ebitda Ratio Less Than Or Equal To One [Member] |
Line of Credit Facility [Line Items] |
Indebtedness To Adjusted Ebitda Ratio Greater Than Three Point Five But Less Than Or Equal To Four [Member] | 15000.00%
Line of Credit Facility, Commitment Fee Amount | 20
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 Greater Than Three Point Five But Less Than Or Equal To Four [Member] | 16250.00%
Line of Credit Facility, Commitment Fee Amount | 25
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 Greater Than Three Point Five But Less Than Or Equal To Four [Member] | 17500.00%
Line of Credit Facility, Commitment Fee Amount | 30
Indebtedness To Adjusted Ebitda Ratio Greater Than Three But Less Than Or Equal To Three Point Five [Member] |
Line of Credit Facility [Line Items] |
Indebtedness To Adjusted Ebitda Ratio Greater Than Three Point Five But Less Than Or Equal To Four [Member] | 18750.00%
Line of Credit Facility, Commitment Fee Amount | 35
Indebtedness To Adjusted Ebitda Ratio Greater Than Three Point Five But Less Than Or Equal To Four [Member] |
Line of Credit Facility [Line Items] |
Indebtedness To Adjusted Ebitda Ratio Greater Than Three Point Five But Less Than Or Equal To Four [Member] | 20000.00%
Line of Credit Facility, Commitment Fee Amount | 40

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- Definition Commitment Fee on Credit Facility, basis points + References No definition available. + Details
Name: | tg_CommitmentFeeOnCreditFacilityBasisPoints
Namespace Prefix: | tg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Balance Type: |
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- Details
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Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |