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Debt And Credit Agreements (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended
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Dec. 31, 2014 | Apr. 23, 2012
Line of Credit Facility [Line Items] |  |
Credit spread over LIBOR, basis points | 1.75%tg_CreditSpreadOverLondonInterbankOfferedRateBasisPoints |
Line of credit facility, covenant terms, maximum debt to EBITDA ratio | 3.0 tg_LineOfCreditFacilityCovenantTermsMaximumDebtToEbitdaRatio |
Line of credit facility, covenant terms, minimum adjusted EBIT-to-interest expense ratio | 2.5 tg_LineOfCreditFacilityCovenantTermsMinimumAdjustedEbitToInterestExpenseRatio |
Line of credit facility, covenant terms, maximum aggregate distributions | $ 100,000,000 tg_LineOfCreditFacilityCovenantTermsMaximumAggregateDividends |
Line of credit facility, covenant terms, percentage of distributions to net income | 50.00%tg_LineOfCreditFacilityCovenantTermsPercentageOfDividendsToNetIncome |
Line of credit facility, covenant terms, minimum shareholders' equity | 320,000,000 tg_LineOfCreditFacilityCovenantTermsMinimumShareholdersEquity |
Line of credit facility, covenant terms, percentage of shareholders' equity to net income | 50.00%tg_LineOfCreditFacilityCovenantTermsPercentageOfShareholdersEquityToNetIncome |
Available credit under the Credit Agreement | 155,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity |
Unsecured Revolving Credit Facility |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, maximum borrowing capacity |  | 350,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = tg_UnsecuredRevolvingCreditFacilityMember
Line of credit facility, term |  | 5 years
Line of credit facility, option to increase additional amount |  | 75,000,000 tg_LineOfCreditFacilityAdditionalBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = tg_UnsecuredRevolvingCreditFacilityMember
Amount borrowed under the Credit Agreement |  | 102,000,000 us-gaap_LineOfCredit / us-gaap_LineOfCreditFacilityAxis = tg_UnsecuredRevolvingCreditFacilityMember
Previous Unsecured Revolving Credit Facility |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, maximum borrowing capacity |  | $ 300,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = tg_PreviousUnsecuredRevolvingCreditFacilityMember
Line of credit facility, term |  | 4 years

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- Definition Credit spread over LIBOR basis points. + References No definition available. + Details
Name: | tg_CreditSpreadOverLondonInterbankOfferedRateBasisPoints
Namespace Prefix: | tg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line of credit facility additional borrowing capacity. + References No definition available. + Details
Name: | tg_LineOfCreditFacilityAdditionalBorrowingCapacity
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line of credit facility, covenant terms, maximum aggregate dividends. + References No definition available. + Details
Name: | tg_LineOfCreditFacilityCovenantTermsMaximumAggregateDividends
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line of credit facility, covenant terms, maximum debt to EBITDA ratio + References No definition available. + Details
Name: | tg_LineOfCreditFacilityCovenantTermsMaximumDebtToEbitdaRatio
Namespace Prefix: | tg_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line of credit facility, covenant terms, minimum adjusted EBIT-to-interest expense ratio. + References No definition available. + Details
Name: | tg_LineOfCreditFacilityCovenantTermsMinimumAdjustedEbitToInterestExpenseRatio
Namespace Prefix: | tg_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line of credit facility, covenant terms, minimum shareholders' equity. + References No definition available. + Details
Name: | tg_LineOfCreditFacilityCovenantTermsMinimumShareholdersEquity
Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line of credit facility, covenant terms, percentage of dividends to net income. + References No definition available. + Details
Name: | tg_LineOfCreditFacilityCovenantTermsPercentageOfDividendsToNetIncome
Namespace Prefix: | tg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line of credit facility, covenant terms, percentage of shareholders' equity to net income. + References No definition available. + Details
Name: | tg_LineOfCreditFacilityCovenantTermsPercentageOfShareholdersEquityToNetIncome
Namespace Prefix: | tg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line of credit facility term. + References No definition available. + Details
Name: | tg_LineOfCreditFacilityTerm
Namespace Prefix: | tg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |