Reserves For Claims Summary Of The Company's Loss Reserves (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]
Known title claims	$ 3,074	$ 3,007
IBNR	28,310	28,722
Total reserve for claims	$ 31,384	$ 31,729	$ 34,801
% of known title reserves	9.80%	9.50%
% of IBNR	90.20%	90.50%
% of total loss reserves	100.00%	100.00%