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Reserves For Claims Summary Of Transactions In Reserves For Claims (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Liability for title claims and claims adjustment expense $ 36,755 $ 33,584 $ 31,333
Provision charged to operations 5,020 5,204  
Payments of claims, net of recoveries $ (1,849) $ (2,953)