XML 129 R107.htm IDEA: XBRL DOCUMENT
v3.19.1

Income Taxes (Schedule Of Additional Information Related To Unrecognized Uncertain Tax Positions) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |
Gross unrecognized tax benefits on uncertain tax positions (reflected in current income tax, other noncurrent liability accounts, or deferred tax assets in the balance sheet) | $ 3,361 | $ 1,962 | $ 3,315 | $ 4,049
Deferred income tax assets related to unrecognized tax benefits on uncertain tax positions (reflected in deferred income tax accounts in the balance sheet) | (211) | (153) | (345) |
Net unrecognized tax benefits on uncertain tax positions, which would impact the effective tax rate if recognized | 3,150 | 1,809 | 2,970 |
Interest and penalties accrued on deductions taken relating to uncertain tax positions (approximately $107, $(1) and $(262) reflected in income tax expense in the income statement in 2018, 2017 and 2016, respectively, with the balance shown in current income tax and other noncurrent liability accounts in the balance sheet) | 243 | 136 | 135 |
Interest and penalties accrued on deductions taken relating to uncertain tax positions, reflected in income tax expense in the income statement | 107 | (1) | (262) |
Related deferred income tax assets recognized on interest and penalties | (56) | (32) | (49) |
Interest and penalties accrued on uncertain tax positions net of related deferred income tax benefits, which would impact the effective tax rate if recognized | 187 | 104 | 86 |
Total net unrecognized tax benefits on uncertain tax positions reflected in the balance sheet, which would impact the effective tax rate if recognized | $ 3,337 | $ 1,913 | $ 3,056 |

X
- Definition Deferred Income Tax Assets Related To Unrecognized Tax Benefits On Uncertain Tax Position + References No definition available. + Details
Name: | tg_DeferredIncomeTaxAssetsRelatedToUnrecognizedTaxBenefitsOnUncertainTaxPosition
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Interest And Penalties Accrued On Uncertain Tax Positions Net Of Related Deferred Income Tax Benefit Which Would Impact The Recognized Effective Tax Rate + References No definition available. + Details
Name: | tg_InterestAndPenaltiesAccruedOnUncertainTaxPositionsNetOfRelatedDeferredIncomeTaxBenefitWhichWouldImpactRecognizedEffectiveTaxRate
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Related Deferred Income Tax Assets Recognized On Interest And Penalties + References No definition available. + Details
Name: | tg_RelatedDeferredIncomeTaxAssetsRecognizedOnInterestAndPenalties
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total Net Unrecognized Tax Benefits On Uncertain Tax Positions Reflected In The Balance Sheet Which Would Impact The Recognized Effective Tax Rate + References No definition available. + Details
Name: | tg_TotalNetUnrecognizedTaxBenefitsOnUncertainTaxPositionsReflectedInBalanceSheetWhichWouldImpactRecognizedEffectiveTaxRate
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=84176650&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant