Pension Plans And Other Postretirement Benefit Plans (Components Of Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4,743	$ 3,891	$ 14,229	$ 11,573
Interest cost	5,978	6,084	17,934	18,277
Expected return on plan assets	(6,900)	(5,950)	(20,700)	(17,900)
Transition obligation recognition	0	0	0	0
Amortization of prior service cost	75	75	225	225
Net loss recognition	3,220	3,019	9,989	8,797
Net periodic benefit cost	7,116	7,119	21,677	20,972
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	971	689	3,035	2,067
Interest cost	1,373	1,256	4,153	3,793
Expected return on plan assets	(402)	(375)	(1,202)	(1,125)
Transition obligation recognition	0	125	0	375
Amortization of prior service cost	(37)	(37)	(111)	(111)
Net loss recognition	1,395	1,250	4,342	3,814
Net periodic benefit cost	$ 3,300	$ 2,908	$ 10,217	$ 8,813