Pension, Savings, And Other Employee Benefits (Schedule Of Components Of Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Pension Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 62	$ 4,351
Interest cost	8,085	8,295
Expected return on plan assets	(8,727)	(9,947)
Amortization of unrecognized, Transition obligation	0	0
Amortization of unrecognized, Prior service cost/(credit)	88	100
Amortization of unrecognized, Actuarial (gain)/loss	2,400	8,824
Net periodic benefit cost	1,908	11,623
Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	134	124
Interest cost	548	556
Expected return on plan assets	(197)	(230)
Amortization of unrecognized, Transition obligation	0	184
Amortization of unrecognized, Prior service cost/(credit)	8	(2)
Amortization of unrecognized, Actuarial (gain)/loss	17	(153)
Net periodic benefit cost	$ 510	$ 479