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, 2018	Dec. 31, 2017	Dec. 31, 2016
Change in Projected Benefit Obligation:
Benefit obligation at beginning of year	$ 58,998	$ 52,975
Service cost	1,295	1,223	$ 1,277
Interest cost	2,056	2,123	2,078
Actuarial loss (gain)	(4,478)	4,502
Benefit payments	(2,112)	(1,825)
Benefit obligation at end of year	55,759	58,998	52,975
Change in Plan Assets:
Fair value of plan assets at beginning of year	53,808	45,498
Actual return on plan assets	(1,894)	7,635
Employer contributions	1,000	2,500
Benefit payments	(2,112)	(1,825)
Fair value of plan assets at end of year	50,802	53,808	$ 45,498
Unfunded status at end of year (included in accounts payable and accrued expenses in 2018 and 2017)	(4,957)	(5,190)
Accumulated benefit obligation	55,683	58,860
Net loss recognized in accumulated other comprehensive loss	$ 15,050	$ 15,135