Employee Benefit Plans (Schedule Of Changes In The Benefit Obligation, The Plan Assets, The Funded Status Of Pension Plans And Components Of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in Projected Benefit Obligation:
Benefit obligation at beginning of year	$ 55,759	$ 58,998
Service cost	1,090	1,295	$ 1,223
Interest cost	2,257	2,056	2,123
Actuarial loss (gain)	7,889	(4,478)
Benefit payments	(2,742)	(2,112)
Benefit obligation at end of year	64,253	55,759	58,998
Change in Plan Assets:
Fair value of plan assets at beginning of year	50,802	53,808
Actual return on plan assets	10,356	(1,894)
Employer contributions	1,000	1,000
Benefit payments	(2,742)	(2,112)
Fair value of plan assets at end of year	59,416	50,802	$ 53,808
Unfunded status at end of year (included in accounts payable and accrued expenses at the end of period)	(4,837)	(4,957)
Accumulated benefit obligation	64,159	55,683
Net loss recognized in accumulated other comprehensive loss	$ 14,897	$ 15,050