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Basis Of Presentation Restricted Cash Text (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Basis Of Presentation [Abstract] |  |
Cash, Period Increase (Decrease) | $ 0.5 | $ 3.8

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- Definition Basis Of Presentation [Abstract] + References No definition available. + Details
Name: | tg_BasisOfPresentationAbstract
Namespace Prefix: | tg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of increase (decrease) in cash. Cash is the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Includes effect from exchange rate changes. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration