XML 41 R25.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Pension And Other Post-Retirement Benefits (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2022
Retirement Benefits [Abstract] |
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 condensed consolidated statements of income for the three and nine months ended September 30, 2022 and 2021, are shown below:
| Pension Benefits |  | Other Post-Retirement Benefits
| Three Months Ended September 30, |  | Three Months Ended September 30,
(In thousands) | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $ | — |  |  | $ | — |  |  | $ | 5 |  |  | $ | 9 |
Interest cost | 2,226 |  |  | 2,101 |  |  | 51 |  |  | 50 |
Expected return on plan assets | (2,044) |  |  | (2,862) |  |  | — |  |  | — |
Amortization of prior service costs, (gains) losses and net transition asset | 3,301 |  |  | 4,268 |  |  | (33) |  |  | (24) |
Net periodic benefit cost | $ | 3,483 |  |  | $ | 3,507 |  |  | $ | 23 |  |  | $ | 35 |
| Pension Benefits |  | Other Post-Retirement Benefits
| Nine Months Ended September 30, |  | Nine Months Ended September 30,
(In thousands) | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $ | — |  |  | $ | — |  |  | $ | 15 |  |  | $ | 26 |
Interest cost | 6,676 |  |  | 6,305 |  |  | 153 |  |  | 151 |
Expected return on plan assets | (6,141) |  |  | (8,587) |  |  | — |  |  | — |
Amortization of prior service costs, (gains) losses and net transition asset | 9,887 |  |  | 12,799 |  |  | (101) |  |  | (72) |
Net periodic benefit cost | $ | 10,422 |  |  | $ | 10,517 |  |  | $ | 67 |  |  | $ | 105 |

X
- 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
Name: | tg_ScheduleOfComponentsOfNetPeriodicBenefitCostForPensionAndOtherPostRetirementBenefitProgramsTableTextBlock
Namespace Prefix: | tg_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration