Pension, Savings, And Other Employee Benefits (Schedule Of Components Of Net Periodic Benefit Cost) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Pension Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 10,000	$ 10,000
Interest cost	7,882,000	9,020,000
Expected return on plan assets	(9,773,000)	(9,392,000)
Amortization of unrecognized, Prior service cost/(credit)	49,000	83,000
Amortization of unrecognized, Actuarial (gain)/loss	2,068,000	2,396,000
Net periodic benefit cost	236,000	2,117,000
Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	28,000	37,000
Interest cost	317,000	360,000
Expected return on plan assets	(229,000)	(241,000)
Amortization of unrecognized, Prior service cost/(credit)	43,000	(291,000)
Amortization of unrecognized, Actuarial (gain)/loss	(233,000)	(244,000)
Net periodic benefit cost	$ (74,000)	$ (379,000)