Pension, Savings, And Other Employee Benefits (Schedule Of Components Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 10	$ 10	$ 19	$ 20
Interest cost	7,380	7,882	14,759	15,764
Expected return on plan assets	(8,890)	(9,772)	(17,781)	(19,545)
Amortization of unrecognized, Prior service cost/(credit)	13	50	26	99
Amortization of unrecognized, Actuarial (gain)/loss	2,380	2,067	4,760	4,135
Net periodic benefit cost/(credit)	893	237	1,783	473
Other Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	27	27	54	55
Interest cost	325	317	651	634
Expected return on plan assets	(237)	(229)	(474)	(458)
Amortization of unrecognized, Prior service cost/(credit)	24	42	48	85
Amortization of unrecognized, Actuarial (gain)/loss	(143)	(232)	(285)	(465)
Net periodic benefit cost/(credit)	$ (4)	$ (75)	$ (6)	$ (149)