Employee Benefit Plans (Schedule Of Net Periodic Benefit Income And Weighted Average Assumptions) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Interest cost	$ 6,645	$ 7,572	$ 6,533
Expected return on plan assets	(11,496)	(12,812)	(10,825)
Amortization of prior service cost	0	495	0
Amortization of net actuarial pension loss	2,319	1,589	1,934
Settlement loss recognized	343	0	0
Net periodic benefit income	$ (2,189)	$ (3,156)	$ (2,358)
Discount rate	4.00%	3.80%	4.70%
Expected return on plan assets, percent	5.40%	6.00%	6.60%
Rate of compensation increase	2.90%	2.90%	3.20%