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Pension And Other Post-Retirement Benefits (Tables) | 6 Months Ended
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Jun. 30, 2021
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 six months ended June 30, 2021 and 2020, are shown below:
| Pension Benefits |  | Other Post-Retirement Benefits
| Three Months Ended June 30, |  | Three Months Ended June 30,
(In thousands) | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | — |  |  | $ | — |  |  | $ | 8 |  |  | $ | 9 |
Interest cost | 2,102 |  |  | 2,535 |  |  | 51 |  |  | 60 |
Expected return on plan assets | (2,863) |  |  | (2,804) |  |  | — |  |  | — |
Amortization of prior service costs, (gains) losses and net transition asset | 4,266 |  |  | 3,814 |  |  | (24) |  |  | (47) |
Net periodic benefit cost | $ | 3,505 |  |  | $ | 3,545 |  |  | $ | 35 |  |  | $ | 22 |
| Pension Benefits |  | Other Post-Retirement Benefits
| Six Months Ended June 30, |  | Six Months Ended June 30,
(In thousands) | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | — |  |  | $ | — |  |  | $ | 17 |  |  | $ | 18 |
Interest cost | 4,204 |  |  | 5,070 |  |  | 101 |  |  | 120 |
Expected return on plan assets | (5,725) |  |  | (5,608) |  |  | — |  |  | — |
Amortization of prior service costs, (gains) losses and net transition asset | 8,531 |  |  | 7,628 |  |  | (48) |  |  | (94) |
Net periodic benefit cost | $ | 7,010 |  |  | $ | 7,090 |  |  | $ | 70 |  |  | $ | 44 |

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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_
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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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