Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Pre-Tax Components Of Net Periodic Cost (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 6,159	$ 5,081	$ 5,318
Interest cost	17,012	19,184	17,826
Expected return on plan assets	(20,804)	(24,512)	(26,092)
Amortization of prior service cost (credit)	605	748	779
Amortization of actuarial loss	17,937	14,451	19,929
Net periodic cost (benefit)	20,909	14,952	17,760
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	22	25	94
Interest cost	1,456	1,741	1,810
Expected return on plan assets	0	0	0
Amortization of prior service cost (credit)	(9,312)	(9,641)	(9,708)
Amortization of actuarial loss	2,047	2,186	3,209
Net periodic cost (benefit)	$ (5,787)	$ (5,689)	$ (4,595)