Pension, Savings, And Other Employee Benefits (Schedule Of Components Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9	$ 10	$ 28	$ 30
Interest cost	7,276	7,648	22,035	23,412
Expected return on plan assets	(9,230)	(9,797)	(27,011)	(29,342)
Amortization of unrecognized, Prior service cost/(credit)	13	48	39	147
Amortization of unrecognized, Actuarial (gain)/loss	2,380	1,971	7,140	6,106
Net periodic benefit cost/(credit)	448	(120)	2,231	353
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	26	28	80	83
Interest cost	328	335	979	969
Expected return on plan assets	(236)	(227)	(710)	(685)
Amortization of unrecognized, Prior service cost/(credit)	23	43	71	128
Amortization of unrecognized, Actuarial (gain)/loss	(140)	(143)	(425)	(608)
Net periodic benefit cost/(credit)	$ 1	$ 36	$ (5)	$ (113)