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Basis Of Presentation and Significant Accounting Policies (Details) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) State Subsidiary | Jan. 01, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) | $ (4,100) |  |  |
Operating Leases, Future Minimum Payments Receivable | $ 3,000 |  |  |
Number of title insurance subsidiaries | Subsidiary | 2 |  |  |
Number of States in which Entity operates | State | 23 |  |  |
Cost Method Investments, Original Cost | $ 6,600 |  | $ 5,400 |
Premium collection period before reserved | 7 months |  |  |
Unrealized holding gains on available-for-sale securities | $ 981 |  | 16,000 | $ 11,900
Unrecognized prior service cost and unrecognized actuarial losses associated with postretirement benefit liabilities | $ 32 |  | $ 58 | $ 110
Potential claim payment period after policy issuance | 20 years |  |  |
Minimum |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Property and equipment useful life | 3 years |  |  |
Finite-Lived Intangible Asset, Useful Life | 1 year |  |  |
Maximum |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Property and equipment useful life | 25 years |  |  |
Finite-Lived Intangible Asset, Useful Life | 30 years |  |  |
Lag time between Policy effective dates and transaction reporting dates | 100 days |  |  |
Accounting Standards Update 2018-02 [Member] | Retained Earnings |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Cumulative-effect adjustment for adoption of new accounting standards |  | $ 3,100 |  |
Accounting Standards Update 2016-01 [Member] | Retained Earnings |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Cumulative-effect adjustment for adoption of new accounting standards |  | $ 16,800 |  |

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