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Pension And Other Post-Retirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2020
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 for the three and nine month periods ended September 30, 2020 and 2019, are shown below:
| Pension Benefits |  | Other Post-Retirement Benefits
| Three Months Ended September 30, |  | Three Months Ended September 30,
(In thousands) | 2020 |  | 2019 |  | 2020 |  | 2019
Service cost | $ | — |  |  | $ | — |  |  | $ | 9 |  |  | $ | 9 |
Interest cost | 2,535 |  |  | 3,067 |  |  | 60 |  |  | 72 |
Expected return on plan assets | (2,804) |  |  | (3,404) |  |  | — |  |  | — |
Amortization of prior service costs, (gains) losses and net transition asset | 3,814 |  |  | 2,729 |  |  | (47) |  |  | (58) |
Net periodic benefit cost | $ | 3,545 |  |  | $ | 2,392 |  |  | $ | 22 |  |  | $ | 23 |
| Pension Benefits |  | Other Post-Retirement Benefits
| Nine Months Ended September 30, |  | Nine Months Ended September 30,
(In thousands) | 2020 |  | 2019 |  | 2020 |  | 2019
Service cost | $ | — |  |  | $ | — |  |  | $ | 28 |  |  | $ | 25 |
Interest cost | 7,605 |  |  | 9,202 |  |  | 180 |  |  | 218 |
Expected return on plan assets | (8,412) |  |  | (10,212) |  |  | — |  |  | — |
Amortization of prior service costs, (gains) losses and net transition asset | 11,441 |  |  | 8,188 |  |  | (141) |  |  | (173) |
Net periodic benefit cost | $ | 10,634 |  |  | $ | 7,178 |  |  | $ | 67 |  |  | $ | 70 |

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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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