Pension, Savings, And Other Employee Benefits (Schedule Of Components Of Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4,351	$ 4,301	$ 8,703	$ 8,602
Interest cost	8,295	8,147	16,589	16,294
Expected return on plan assets	(9,947)	(11,724)	(19,893)	(23,446)
Amortization of unrecognized, Transition obligation	0	0	0	0
Amortization of unrecognized, Prior service cost/(credit)	100	104	199	208
Actuarial (gain)/loss	8,824	5,027	17,648	10,054
Net periodic benefit cost	11,623	5,855	23,246	11,712
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	124	144	248	288
Interest cost	556	552	1,112	1,104
Expected return on plan assets	(230)	(297)	(461)	(596)
Amortization of unrecognized, Transition obligation	184	246	368	492
Amortization of unrecognized, Prior service cost/(credit)	(2)	(2)	(4)	(4)
Actuarial (gain)/loss	(153)	(260)	(306)	(520)
Net periodic benefit cost	$ 479	$ 383	$ 957	$ 764