Retirement Plans (Schedule Of Net Periodic Benefit Cost (Credit) For Pension And Postretirement Plans) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	1,783	1,880	3,566	3,760
Expected return on plan assets	(3,090)	(3,326)	(6,180)	(6,652)
Amortization of net actuarial (gain) loss	1,574	797	3,147	1,593
Net periodic benefit cost (credit)	267	(649)	533	(1,299)
Supplemental Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	101	113	201	227
Amortization of prior service cost (credit)	0	13	0	25
Amortization of net actuarial (gain) loss	31	5	62	10
Net periodic benefit cost (credit)	132	131	263	262
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	8	16	16
Interest cost	10	12	20	23
Amortization of prior service cost (credit)	0	0	0	0
Amortization of net actuarial (gain) loss	(13)	(18)	(26)	(35)
Net periodic benefit cost (credit)	$ 5	$ 2	$ 10	$ 4