Pension Plans And Other Postretirement Benefit Plans (Components Of Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4,743	$ 3,891	$ 9,486	$ 7,682
Interest cost	5,978	6,084	11,956	12,193
Expected return on plan assets	(6,900)	(5,950)	(13,800)	(11,950)
Transition obligation recognition	0	0	0	0
Amortization of prior service cost	75	75	150	150
Net loss recognition	3,222	3,021	6,769	5,778
Net periodic benefit cost	7,118	7,121	14,561	13,853
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,032	689	2,064	1,378
Interest cost	1,390	1,256	2,780	2,537
Expected return on plan assets	(400)	(375)	(800)	(750)
Transition obligation recognition	0	125	0	250
Amortization of prior service cost	(37)	(37)	(74)	(74)
Net loss recognition	1,426	1,252	2,947	2,564
Net periodic benefit cost	$ 3,411	$ 2,910	$ 6,917	$ 5,905