Pension, Savings, And Other Employee Benefits (Schedule Of Components Of Net Periodic Benefit Cost) (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Pension Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 10,000	$ 8,000	$ 30,000	$ 42,000
Interest cost		9,278,000	8,866,000	27,318,000	26,186,000
Expected return on plan assets		(9,354,000)	(10,034,000)	(28,137,000)	(30,070,000)
Amortization of unrecognized, Prior service cost/(credit)		84,000	86,000	250,000	260,000
Amortization of unrecognized, Actuarial (gain)/loss		2,786,000	1,904,000	7,577,000	5,174,000
Net periodic benefit cost		2,804,000	830,000	7,038,000	1,592,000
ACS 715 curtailment gain		0	0	0	0
ACS 715 special termination benefits	[1]	0	1,009,000	0	1,009,000
Total periodic benefit costs		2,804,000	1,839,000	7,038,000	2,601,000
Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		37,000	45,000	112,000	155,000
Interest cost		342,000	400,000	1,062,000	1,316,000
Expected return on plan assets		(243,000)	(259,000)	(726,000)	(769,000)
Amortization of unrecognized, Prior service cost/(credit)		(291,000)	(290,000)	(873,000)	(872,000)
Amortization of unrecognized, Actuarial (gain)/loss		(334,000)	(377,000)	(822,000)	(755,000)
Net periodic benefit cost		(489,000)	(481,000)	(1,247,000)	(925,000)
ACS 715 curtailment gain		(8,283,000)	0	(8,283,000)	0
ACS 715 special termination benefits	[1]	0	0	0	0
Total periodic benefit costs		$ (8,772,000)	$ (481,000)	$ (9,530,000)	$ (925,000)

[1] (a) In third quarter 2014, a one-time special termination benefits charge was recognized related to recalculation of a participant's benefit under a non-qualified plan upon retirement.