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, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in Projected Benefit Obligation:
Benefit obligation at beginning of year	$ 49,715	$ 50,218
Service cost	1,277	1,252	$ 1,008
Interest cost	2,078	1,899	1,800
Actuarial loss (gain)	1,976	(1,830)
Benefit payments	(2,071)	(1,824)
Benefit obligation at end of year	52,975	49,715	50,218
Change in Plan Assets:
Fair value of plan assets at beginning of year	42,341	42,606
Actual return on plan assets	3,228	59
Employer contributions	2,000	1,500
Benefit payments	(2,071)	(1,824)
Fair value of plan assets at end of year	45,498	42,341	$ 42,606
Unfunded status at end of year (included in accounts payable and accrued expenses in 2016 and 2015)	(7,477)	(7,374)
Accumulated benefit obligation	52,824	49,632
Net loss recognized in accumulated other comprehensive loss	$ 16,528	$ 16,361