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Acquisitions (Schedule Of Preliminary Estimated Purchase Price Allocation) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Oct. 02, 2012
--- | --- | --- | --- | --- | ---
Identifiable intangible assets: |  |  |  |  |
Goodwill | $ 169,687 us-gaap_Goodwill | $ 172,788 us-gaap_Goodwill | $ 176,620 us-gaap_Goodwill | $ 165,372 us-gaap_Goodwill |
AACOA |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Accounts receivable |  |  |  |  | 12,477 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember
Inventories |  |  |  |  | 4,708 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember
Property, plant & equipment |  |  |  |  | 15,116 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember
Identifiable intangible assets: |  |  |  |  |
Other assets (current & noncurrent) |  |  |  |  | 42 tg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAndNoncurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember
Trade payables & accrued expenses |  |  |  |  | (6,574)tg_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesAccountsPayableAndAccruedLiabilities / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember
Total identifiable net assets |  |  |  |  | 40,369 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember
Purchase price, net of cash received |  |  |  |  | 54,065 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember
Goodwill |  |  |  |  | 13,696 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember
AACOA | Customer relationships |  |  |  |  |
Identifiable intangible assets: |  |  |  |  |
Identifiable intangible assets - Indefinite |  |  |  |  | 4,800 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
AACOA | Trade names |  |  |  |  |
Identifiable intangible assets: |  |  |  |  |
Identifiable intangible assets - finite |  |  |  |  | 4,800 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
AACOA | Proprietary technology |  |  |  |  |
Identifiable intangible assets: |  |  |  |  |
Identifiable intangible assets - Indefinite |  |  |  |  | 3,400 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentedTechnologyMember
AACOA | Noncompete agreements |  |  |  |  |
Identifiable intangible assets: |  |  |  |  |
Identifiable intangible assets - Indefinite |  |  |  |  | $ 1,600 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = tg_AacoaIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember

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