Pension, Savings, And Other Employee Benefits (Schedule Of Net Periodic Cost) (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended			12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2011 Pension Benefits [Member]	Sep. 30, 2010 Pension Benefits [Member]	Sep. 30, 2011 Pension Benefits [Member]	Sep. 30, 2010 Pension Benefits [Member]	Sep. 30, 2011 Other Benefits [Member]	Sep. 30, 2010 Other Benefits [Member]	Sep. 30, 2011 Other Benefits [Member]	Sep. 30, 2010 Other Benefits [Member]	Sep. 30, 2011 Non-Qualified Plans [Member]	Dec. 31, 2010 Non-Qualified Plans [Member]	Sep. 30, 2011 Savings Plan [Member]	Dec. 31, 2010 Savings Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,917,000	$ 3,863,000	$ 11,519,000	$ 11,419,000	$ 119,000	$ 114,000	$ 407,000	$ 386,000
Interest cost	8,323,000	7,908,000	24,617,000	23,581,000	556,000	518,000	1,660,000	1,708,000
Expected return on plan assets	(11,717,000)	(11,892,000)	(35,164,000)	(35,651,000)	(296,000)	(295,000)	(892,000)	(871,000)
Amortization of unrecognized, Transition obligation					246,000	247,000	740,000	740,000
Amortization of unrecognized, Prior service cost/(credit)	104,000	181,000	313,000	314,000	(2,000)	(2,000)	(7,000)	(6,000)
Amortization of unrecognized, Actuarial (gain)/loss	5,861,000	3,535,000	15,914,000	11,078,000	(273,000)	(355,000)	(793,000)	(786,000)
Net periodic benefit cost	5,488,000	3,595,000	17,199,000	10,741,000	350,000	227,000	1,115,000	1,171,000
Pension contributions										4,500,000		1,200,000
Expected pension contribution									5,300,000
Expected contributions											$ 1,300,000