Reserves For Claims Summary Of Transactions In Reserves For Claims (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Liability for Title Claims and Claims Adjustment Expense	$ 32,484	$ 34,801	$ 35,305
(Benefit) provision, charged to operations	(842)	3,311
Payments of claims, net of recoveries	$ (1,475)	$ (3,815)