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Pension And Other Post-Retirement Benefits (Tables) | 6 Months Ended
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Jun. 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 PostRetirement Benefits
| Three Months Ended June 30, |  | Three Months Ended June 30,
(In thousands) | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | — |  |  | $ | 5 |  |  | $ | 8 |  |  | $ | 10 |
Interest cost | 3,068 |  |  | 2,882 |  |  | 73 |  |  | 69 |
Expected return on plan assets | (3,404 | ) |  | (3,761 | ) |  | — |  |  | — |
Amortization of prior service costs, (gains) losses and net transition asset | 2,730 |  |  | 3,428 |  |  | (57 | ) |  | (54 | )
Net periodic benefit cost | $ | 2,394 |  |  | $ | 2,554 |  |  | $ | 24 |  |  | $ | 25 |
| Pension Benefits |  | Other Post-Retirement Benefits
| Six Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | — |  |  | $ | 10 |  |  | $ | 16 |  |  | $ | 20 |
Interest cost | 6,135 |  |  | 5,764 |  |  | 146 |  |  | 138 |
Expected return on plan assets | (6,808 | ) |  | (7,522 | ) |  | — |  |  | — |
Amortization of prior service costs, (gains) losses and net transition asset | 5,459 |  |  | 6,856 |  |  | (115 | ) |  | (108 | )
Net periodic benefit cost | $ | 4,786 |  |  | $ | 5,108 |  |  | $ | 47 |  |  | $ | 50 |

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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
Period Type: | duration