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Reserves for Claims Summary Of The Company's Loss Reserves (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract] |  |  |  |
Known title claims | $ 3,007 | $ 4,646 |  |
IBNR | 28,722 | 30,155 |  |
Total reserve for claims | $ 31,729 | $ 34,801 | $ 35,305 | $ 37,788
% of Known title claims | 9.50% | 13.40% |  |
% of IBNR | 90.50% | 86.60% |  |
% of Total reserve for claims | 100.00% | 100.00% |  |

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- Definition Liability For Title Claims And Claims Adjustment Expense Incurred But Not Reported (IBNR) Percentage. + References No definition available. + Details
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- Definition Liability for title claims and claims adjustment expense known claims percentage. + References No definition available. + Details
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Data Type: | num:percentItemType
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- Definition Liability for unpaid claims and claims adjustment expense reported and incurred but not reported (IBNR) claims percentage. + References No definition available. + Details
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Namespace Prefix: | itic_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling asserted and unasserted claims estimated to have been incurred by the insureds on or before the balance sheet date pertaining to the existence of a lien, encumbrance, defect or other matter purportedly affecting the title to the interest as insured. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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- Definition Estimated costs as of the balance sheet date of settling insured claims and costs incurred in the claims settlement process for claims that have not yet been submitted to the insurance company for reimbursement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.W) -URI http://asc.fasb.org/extlink&oid=27015833&loc=d3e570705-122907 + Details
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- Definition Costs of settling insured claims and costs incurred in the claims settlement process for the specified year specifically for claims that have already been submitted to the insurance company for reimbursement. + References No definition available. + Details
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