Retirement Agreements And Other Postretirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the year	$ 0	$ 0
Interest cost on the projected benefit obligation	8	8
Amortization of unrecognized losses	0	0
Net periodic benefits costs	8	$ 8
Employee benefits and other payments	$ 12,100		$ 10,900