Reserves For Claims Summary Of Transactions In Reserves For Claims (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Liability for Title Claims and Claims Adjustment Expense	$ 31,384	$ 31,729	$ 34,801
Provision (benefit), charged to operations	226	(332)
Payments of claims, net of recoveries	$ (571)	$ (2,740)