XML 45 R27.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
--- | ---
Jun. 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 six months ended June 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 | 2,674 |  |  | 335 |  |  | — |  |  | 3,009 |
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | (373 | ) |  | 3,900 |  |  | 3,527 |
Net other comprehensive income (loss) - current period | 2,674 |  |  | (38 | ) |  | 3,900 |  |  | 6,536 |
Ending balance, June 30, 2017 | $ | (91,296 | ) |  | $ | 825 |  |  | $ | (86,227 | ) |  | $ | (176,698 | )
The following table summarizes the after-tax changes in accumulated other comprehensive income (loss) for the six months ended June 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 | 23,648 |  |  | 86 |  |  | — |  |  | 23,734 |
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | 931 |  |  | 4,607 |  |  | 5,538 |
Net other comprehensive income (loss) - current period | 23,648 |  |  | 1,017 |  |  | 4,607 |  |  | 29,272 |
Ending balance, June 30, 2016 | $ | (89,159 | ) |  | $ | 644 |  |  | $ | (90,932 | ) |  | $ | (179,447 | )
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 June 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 | $ | 321 |  |  | Cost of sales
Foreign currency forward contracts, before taxes | 16 |  |  | Cost of sales
Total, before taxes | 337 |  |  |
Income tax expense (benefit) | 125 |  |  | Income taxes
Total, net of tax | $ | 212 |  |  |
Amortization of pension and other post-retirement benefits: |  |  |
Actuarial gain (loss) and prior service costs, before taxes | $ | (3,061 | ) |  | (a)
Income tax expense (benefit) | (1,111 | ) |  | Income taxes
Total, net of tax | $ | (1,950 | ) |  |
(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, 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 | $ | 554 |  |  | Cost of sales
Foreign currency forward contracts, before taxes | 31 |  |  | Cost of sales
Total, before taxes | 585 |  |  |
Income tax expense (benefit) | 212 |  |  | Income taxes
Total, net of tax | $ | 373 |  |  |
Amortization of pension and other post-retirement benefits: |  |  |
Actuarial gain (loss) and prior service costs, before taxes | $ | (6,122 | ) |  | (a)
Income tax expense (benefit) | (2,222 | ) |  | Income taxes
Total, net of tax | $ | (3,900 | ) |  |
(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 June 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 | $ | (525 | ) |  | Cost of sales
Foreign currency forward contracts, before taxes | 16 |  |  | Cost of sales
Total, before taxes | (509 | ) |  |
Income tax expense (benefit) | (182 | ) |  | Income taxes
Total, net of tax | $ | (327 | ) |  |
Amortization of pension and other post-retirement benefits: |  |  |
Actuarial gain (loss) and prior service costs, before taxes | $ | (3,336 | ) |  | (a)
Income tax expense (benefit) | (1,211 | ) |  | Income taxes
Total, net of tax | $ | (2,125 | ) |  |
(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, 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 | $ | (1,509 | ) |  | Cost of sales
Foreign currency forward contracts, before taxes | 31 |  |  | Cost of sales
Total, before taxes | (1,478 | ) |  |
Income tax expense (benefit) | (547 | ) |  | Income taxes
Total, net of tax | $ | (931 | ) |  |
Amortization of pension and other post-retirement benefits: |  |  |
Actuarial gain (loss) and prior service costs, before taxes | $ | (6,673 | ) |  | (a)
Income tax expense (benefit) | (2,066 | ) |  | Income taxes
Total, net of tax | $ | (4,607 | ) |  |
(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=66004124&loc=SL7669686-108580 + Details
Name: | us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration