XML 45 R27.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2017
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 nine months ended September 30, 2017:
(In Thousands) | Foreign currency translation adjustment |  | Gain (loss) on derivative financial instruments |  | Pension and other post-retirement benefit adjustments |  | Total
Beginning balance, January 1, 2017 | $ | (93,970 | ) |  | $ | 863 |  |  | $ | (90,127 | ) |  | $ | (183,234 | )
Other comprehensive income (loss) before reclassifications | 9,817 |  |  | 817 |  |  | — |  |  | 10,634 |
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | (529 | ) |  | 5,754 |  |  | 5,225 |
Net other comprehensive income (loss) - current period | 9,817 |  |  | 288 |  |  | 5,754 |  |  | 15,859 |
Ending balance, September 30, 2017 | $ | (84,153 | ) |  | $ | 1,151 |  |  | $ | (84,373 | ) |  | $ | (167,375 | )
The following table summarizes the after-tax changes in accumulated other comprehensive income (loss) for the nine months ended September 30, 2016:
(In Thousands) | Foreign currency translation adjustment |  | Gain (loss) on derivative financial instruments |  | Pension and other post-retirement benefit adjustments |  | Total
Beginning balance, January 1, 2016 | $ | (112,807 | ) |  | $ | (373 | ) |  | $ | (95,539 | ) |  | $ | (208,719 | )
Other comprehensive income (loss) before reclassifications | 22,929 |  |  | (60 | ) |  | — |  |  | 22,869 |
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | 1,023 |  |  | 6,573 |  |  | 7,596 |
Net other comprehensive income (loss) - current period | 22,929 |  |  | 963 |  |  | 6,573 |  |  | 30,465 |
Ending balance, September 30, 2016 | $ | (89,878 | ) |  | $ | 590 |  |  | $ | (88,966 | ) |  | $ | (178,254 | )
Schedule Of Reclassifications Of Balances Out Of Accumulated Other Comprehensive Income (Loss) Into Net Income | Reclassifications of balances out of accumulated other comprehensive income (loss) into net income (loss) for the three months ended September 30, 2017 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 | $ | 231 |  |  | Cost of sales
Foreign currency forward contracts, before taxes | 15 |  |  | Cost of sales
Total, before taxes | 246 |  |  |
Income tax expense (benefit) | 90 |  |  | Income taxes
Total, net of tax | $ | 156 |  |  |
Amortization of pension and other post-retirement benefits: |  |  |
Actuarial gain (loss) and prior service costs, before taxes | $ | (2,911 | ) |  | (a)
Income tax expense (benefit) | (1,057 | ) |  | Income taxes
Total, net of tax | $ | (1,854 | ) |  |
(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 nine months ended September 30, 2017 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 | $ | 785 |  |  | Cost of sales
Foreign currency forward contracts, before taxes | 46 |  |  | Cost of sales
Total, before taxes | 831 |  |  |
Income tax expense (benefit) | 302 |  |  | Income taxes
Total, net of tax | $ | 529 |  |  |
Amortization of pension and other post-retirement benefits: |  |  |
Actuarial gain (loss) and prior service costs, before taxes | $ | (9,033 | ) |  | (a)
Income tax expense (benefit) | (3,279 | ) |  | Income taxes
Total, net of tax | $ | (5,754 | ) |  |
(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 three months ended September 30, 2016 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 | $ | (160 | ) |  | Cost of sales
Foreign currency forward contracts, before taxes | 15 |  |  | Cost of sales
Total, before taxes | (145 | ) |  |
Income tax expense (benefit) | (53 | ) |  | Income taxes
Total, net of tax | $ | (92 | ) |  |
Amortization of pension and other post-retirement benefits: |  |  |
Actuarial gain (loss) and prior service costs, before taxes | $ | (3,086 | ) |  | (a)
Income tax expense (benefit) | (1,120 | ) |  | Income taxes
Total, net of tax | $ | (1,966 | ) |  |
(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 nine months ended September 30, 2016 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 | $ | (1,669 | ) |  | Cost of sales
Foreign currency forward contracts, before taxes | 46 |  |  | Cost of sales
Total, before taxes | (1,623 | ) |  |
Income tax expense (benefit) | (600 | ) |  | Income taxes
Total, net of tax | $ | (1,023 | ) |  |
Amortization of pension and other post-retirement benefits: |  |  |
Actuarial gain (loss) and prior service costs, before taxes | $ | (9,759 | ) |  | (a)
Income tax expense (benefit) | (3,186 | ) |  | Income taxes
Total, net of tax | $ | (6,573 | ) |  |
(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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
Name: | us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration