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Pension And Other Post-Retirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Schedule Of Components Of Net Periodic Benefit Cost For Pension And Other Post-Retirement Benefit Programs | The components of net periodic benefit cost for the pension and other postretirement benefit programs reflected in the consolidated statements of income are shown below:
| Pension Benefits |  | Other Post-Retirement Benefits
| Three Months Ended September 30, |  | Three Months Ended September 30,
(In thousands) | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | — |  |  | $ | 7 |  |  | $ | 9 |  |  | $ | 7 |
Interest cost | 3,067 |  |  | 2,818 |  |  | 72 |  |  | 65 |
Expected return on plan assets | (3,404 | ) |  | (3,736 | ) |  | — |  |  | — |
Amortization of prior service costs, (gains) losses and net transition asset | 2,729 |  |  | 3,565 |  |  | (58 | ) |  | (75 | )
Net periodic benefit cost | $ | 2,392 |  |  | $ | 2,654 |  |  | $ | 23 |  |  | $ | (3 | )
| Pension Benefits |  | Other Post-Retirement Benefits
| Nine Months Ended September 30, |  | Nine Months Ended September 30,
(In thousands) | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | — |  |  | $ | 17 |  |  | $ | 25 |  |  | $ | 27 |
Interest cost | 9,202 |  |  | 8,582 |  |  | 218 |  |  | 203 |
Expected return on plan assets | (10,212 | ) |  | (11,258 | ) |  | — |  |  | — |
Amortization of prior service costs, (gains) losses and net transition asset | 8,188 |  |  | 10,421 |  |  | (173 | ) |  | (183 | )
Net periodic benefit cost | $ | 7,178 |  |  | $ | 7,762 |  |  | $ | 70 |  |  | $ | 47 |

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- Definition Schedule Of Components Of Net Periodic Benefit Cost For Pension And Other Post-Retirement Benefit Programs [Table Text Block] + References No definition available. + Details
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Namespace Prefix: | tg_
Data Type: | nonnum:textBlockItemType
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
Name: | us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration