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New Accounting Pronouncements New Accounting Pronouncements (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
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New Accounting Pronouncements [Abstract] |  |  |
Operating Lease, Right-of-Use Asset | $ 19,526 | $ 21,000 | $ 0
Operating Lease, Liability, Noncurrent | $ 18,197 | $ 22,000 |

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- Definition New Accounting Pronouncements [Abstract] + References No definition available. + Details
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Namespace Prefix: | tg_
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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