Retirement Plans (Schedule Of Net Periodic Benefit Cost (Credit) For Pension And Postretirement Plans) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	$ (2,600)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	$ 0	$ 0	$ 0
Interest cost	1,721	1,755	5,246	5,320
Expected return on plan assets	(3,039)	(3,090)	(8,548)	(9,270)
Amortization of net actuarial (gain) loss	1,293	1,297	4,612	4,445
Net periodic benefit cost (credit)	2,600	(38)	3,935	495
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	2,625	0	2,625	0
Supplemental Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	101	101	302	302
Expected return on plan assets	0	0	0	0
Amortization of net actuarial (gain) loss	29	31	87	92
Net periodic benefit cost (credit)	130	132	389	394
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	0	0	0	0
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	8	15	25
Interest cost	10	10	29	30
Expected return on plan assets	0	0	0	0
Amortization of net actuarial (gain) loss	(17)	(13)	(50)	(40)
Net periodic benefit cost (credit)	(2)	5	(6)	15
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	$ 0	$ 0	$ 0	$ 0