Employee Benefit Plans (Summary Of Pension Plans Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at prior valuation date	$ 120,667	$ 116,695
Service cost	651	621	$ 500
Interest cost	3,756	3,826	3,944
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(6,622)	(6,780)
Actuarial (gain) loss	(6,389)	6,305
Projected benefit obligation at valuation date	112,063	120,667	116,695
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at prior valuation date	108,260	99,537
Actual return on plan assets	(2,244)	9,564
Employer contributions	24	5,939
Benefits paid	(6,622)	(6,780)
Fair value of plan assets at valuation date	99,418	108,260	$ 99,537
Funded status and net amount recognized at valuation date	$ (12,645)	$ (12,407)