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Goodwill And Other Intangible Assets (Schedule Of Goodwill And Other Intangibles) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Goodwill | $ 169,687 us-gaap_Goodwill | $ 172,788 us-gaap_Goodwill | $ 176,620 us-gaap_Goodwill | $ 165,372 us-gaap_Goodwill
Identifiable intangible assets: |  |  |  |
Total carrying value of other intangibles | 45,442 us-gaap_OtherIntangibleAssetsNet | 53,512 us-gaap_OtherIntangibleAssetsNet |  |
Intangible Assets, Net (Including Goodwill) | 215,129 us-gaap_IntangibleAssetsNetIncludingGoodwill | 226,300 us-gaap_IntangibleAssetsNetIncludingGoodwill |  |
Customer relationships |  |  |  |
Identifiable intangible assets: |  |  |  |
Other identifiable intangibles | 21,620 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 25,962 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |
Other identifiable intangibles, cost basis | 29,117 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 31,357 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |
Proprietary technology |  |  |  |
Identifiable intangible assets: |  |  |  |
Other identifiable intangibles | 11,824 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = tg_ProprietaryTechnologyMember | 14,356 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = tg_ProprietaryTechnologyMember |  |
Other identifiable intangibles, cost basis | 18,228 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = tg_ProprietaryTechnologyMember | 18,851 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = tg_ProprietaryTechnologyMember |  |
Noncompete agreements |  |  |  |
Identifiable intangible assets: |  |  |  |
Other identifiable intangibles | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember | 600 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  |
Identifiable Intangible Asset, Useful Life (Yrs) | 2 years |  |  |
Other identifiable intangibles, cost basis | 4,154 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember | 4,154 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  |
Trade names |  |  |  |
Identifiable intangible assets: |  |  |  |
Trade names | $ 11,998 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | $ 12,594 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  |
Minimum | Customer relationships |  |  |  |
Identifiable intangible assets: |  |  |  |
Identifiable Intangible Asset, Useful Life (Yrs) | 10 years |  |  |
Maximum | Customer relationships |  |  |  |
Identifiable intangible assets: |  |  |  |
Identifiable Intangible Asset, Useful Life (Yrs) | 12 years |  |  |
Maximum | Proprietary technology |  |  |  |
Identifiable intangible assets: |  |  |  |
Identifiable Intangible Asset, Useful Life (Yrs) | 15 years |  |  |

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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance. + References No definition available. + Details
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