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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 27 -Subparagraph a, b false 7 (Increase) decrease in net unearned premiums 4 trh_IncreaseDecreaseInNetUnearnedPremiums trh false credit duration The net change during the period in the unearned portion of premiums written, excluding the portion amortized into income. false false false false false false false false false false false terselabel false 1 false true false false -48739000 -48739 false false false 2 false true false false 35510000 35510 false false false 3 false true false false -56280000 -56280 false false false 4 false true false false -13133000 -13133 false false false xbrli:monetaryItemType monetary The net change during the period in the unearned portion of premiums written, excluding the portion amortized into income. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 27 -Subparagraph a, b true 9 Net investment income 4 us-gaap_NetInvestmentIncome us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 123840000 123840 false false false 2 false true false false 123205000 123205 false false false 3 false true false false 352224000 352224 false false false 4 false true false false 344224000 344224 false false false xbrli:monetaryItemType monetary The income earned from investments in securities and property, equipment and other capital assets. 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The amount is charged to income if the decline in fair value is deemed to be other than temporary. 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