Pension Plans And Other Postretirement Benefit Plans (Components Of Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5,018	$ 4,743
Interest cost	6,706	5,978
Expected return on plan assets	(8,110)	(6,900)
Amortization of prior service cost	6	75
Net loss recognition	1,157	3,547
Net periodic benefit cost	4,777	7,443
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	974	1,032
Interest cost	1,353	1,390
Expected return on plan assets	(472)	(400)
Amortization of prior service cost	(43)	(37)
Net loss recognition	826	1,521
Net periodic benefit cost	$ 2,638	$ 3,506