XML 49 R31.htm IDEA: XBRL DOCUMENT
v3.19.2

Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Schedule Of After-Tax Changes In Accumulated Other Comprehensive Income (Loss) |  |  | The following table summarizes the after-tax changes in accumulated other comprehensive income (loss) for the six months ended June 30, 2019:
(In thousands) | Foreign currency translation adjustment |  | Gain (loss) on derivative financial instruments |  | Pension and other post-retirement benefit adjustments |  | Total
Beginning balance, January 1, 2019 | $ | (96,940 | ) |  | $ | (1,601 | ) |  | $ | (81,446 | ) |  | $ | (179,987 | )
Other comprehensive income (loss) before reclassifications | (283 | ) |  | (1,218 | ) |  | — |  |  | (1,501 | )
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | 1,486 |  |  | 4,158 |  |  | 5,644 |
Net other comprehensive income (loss) - current period | (283 | ) |  | 268 |  |  | 4,158 |  |  | 4,143 |
Ending balance, June 30, 2019 | $ | (97,223 | ) |  | $ | (1,333 | ) |  | $ | (77,288 | ) |  | $ | (175,844 | )
| The following table summarizes the after-tax changes in accumulated other comprehensive income (loss) for the six months ended June 30, 2018:
(In Thousands) | Foreign currency translation adjustment |  | Gain (loss) on derivative financial instruments |  | Pension and other post-retirement benefit adjustments |  | Total
Beginning balance, January 1, 2018 | $ | (86,178 | ) |  | $ | 459 |  |  | $ | (90,950 | ) |  | $ | (176,669 | )
Other comprehensive income (loss) before reclassifications | (8,905 | ) |  | (829 | ) |  | — |  |  | (9,734 | )
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | (361 | ) |  | 5,223 |  |  | 4,862 |
Net other comprehensive income (loss) - current period | (8,905 | ) |  | (1,190 | ) |  | 5,223 |  |  | (4,872 | )
Ending balance, June 30, 2018 | $ | (95,083 | ) |  | $ | (731 | ) |  | $ | (85,727 | ) |  | $ | (181,541 | )
Schedule Of Reclassifications Of Balances Out Of Accumulated Other Comprehensive Income (Loss) Into Net Income |
(In Thousands) | Amount reclassified from other comprehensive income (loss) |  | Location of gain (loss) reclassified from accumulated other comprehensive income (loss) to net income (loss)
Gain (loss) on derivative financial instruments: |  |  |
Aluminum future contracts, before taxes | $ | (606 | ) |  | Cost of sales
Foreign currency forward contracts, before taxes | (369 | ) |  | Selling, general & administrative
Foreign currency forward contracts, before taxes | 16 |  |  | Cost of sales
Total, before taxes | (959 | ) |  |
Income tax expense (benefit) | (131 | ) |  | Income taxes
Total, net of tax | $ | (828 | ) |  |
Amortization of pension and other post-retirement benefits: |  |  |
Actuarial gain (loss) and prior service costs, before taxes | $ | (2,672 | ) |  | (a)
Income tax expense (benefit) | (593 | ) |  | Income taxes
Total, net of tax | $ | (2,079 | ) |  |
(a) | This component of accumulated other comprehensive income (loss) is included in the computation of net periodic pension cost (see Note 9 for additional detail).
| Reclassifications of balances out of accumulated other comprehensive income (loss) into net income for the three months ended June 30, 2018 are summarized as follows:
(In Thousands) | Amount reclassified from other comprehensive income (loss) |  | Location of gain (loss) reclassified from accumulated other comprehensive income (loss) to net income (loss)
Gain (loss) on derivative financial instruments: |  |  |
Aluminum future contracts, before taxes | $ | 712 |  |  | Cost of sales
Foreign currency forward contracts, before taxes | (378 | ) |  | Selling, general & administrative
Foreign currency forward contracts, before taxes | 16 |  |  | Cost of sales
Total, before taxes | 350 |  |  |
Income tax expense (benefit) | 142 |  |  | Income taxes
Total, net of tax | $ | 208 |  |  |
Amortization of pension and other post-retirement benefits: |  |  |
Actuarial gain (loss) and prior service costs, before taxes | $ | (3,372 | ) |  | (a)
Income tax expense (benefit) | (761 | ) |  | Income taxes
Total, net of tax | $ | (2,611 | ) |  |
(a) | This component of accumulated other comprehensive income (loss) is included in the computation of net periodic pension cost (see Note 9 for additional detail).
| Reclassifications of balances out of accumulated other comprehensive income (loss) into net income (loss) for the six months ended June 30, 2019 are summarized as follows:
(In thousands) | Amount reclassified from other comprehensive income (loss) |  | Location of gain (loss) reclassified from accumulated other comprehensive income (loss) to net income (loss)
Gain (loss) on derivative financial instruments: |  |  |
Aluminum future contracts, before taxes | $ | (1,223 | ) |  | Cost of sales
Foreign currency forward contracts, before taxes | (560 | ) |  | Selling, general & administrative
Foreign currency forward contracts, before taxes | 31 |  |  | Cost of sales
Total, before taxes | (1,752 | ) |  |
Income tax expense (benefit) | (266 | ) |  | Income taxes
Total, net of tax | $ | (1,486 | ) |  |
Amortization of pension and other post-retirement benefits: |  |  |
Actuarial gain (loss) and prior service costs, before taxes | $ | (5,343 | ) |  | (a)
Income tax expense (benefit) | (1,185 | ) |  | Income taxes
Total, net of tax | $ | (4,158 | ) |  |
(a) | This component of accumulated other comprehensive income (loss) is included in the computation of net periodic pension cost (see Note 9 for additional detail).

X
- Definition Schedule Of Reclassifications Of Balances Out Of Accumulated Other Comprehensive Income (Loss) Into Net Income [Table Text Block] + References No definition available. + Details
Name: | tg_ScheduleOfReclassificationsOfBalancesOutOfAccumulatedOtherComprehensiveIncomeLossIntoNetIncomeTableTextBlock
Namespace Prefix: | tg_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
Name: | us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration