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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