Pension And Other Post-Retirement Benefits (Schedule Of Components Of Net Periodic Benefit Cost For Pension And Other Post-Retirement Benefit Programs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 52	$ 144	$ 124	$ 288
Interest cost	3,365	3,313	6,730	6,625
Expected return on plan assets	(3,979)	(4,407)	(7,957)	(8,814)
Amortization of prior service costs, gains or losses and net transition asset	3,384	4,024	6,768	8,048
Net periodic benefit cost	2,822	3,074	5,665	6,147
Other Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	10	12	21	24
Interest cost	84	83	169	167
Expected return on plan assets		0
Amortization of prior service costs, gains or losses and net transition asset	(47)	(40)	(95)	(80)
Net periodic benefit cost	$ 47	$ 55	$ 95	$ 111