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Reserves for Claims Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Realized claim recoveries $ 1,900 $ 570 $ 1,000
Provision rate for title insurance claims (0.20%) 2.40% 0.20%
Minimum      
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Large claim threshold $ 500