Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Pre-Tax Components Of Net Periodic Cost (Benefit)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5,081	$ 5,318	$ 5,238
Interest cost	19,184	17,826	19,986
Expected return on plan assets	(24,512)	(26,092)	(28,755)
Curtailment credit	0	0	0
Amortization of prior service cost (credit)	748	779	770
Amortization of actuarial loss	14,451	19,929	15,356
Net periodic cost (benefit)	14,952	17,760	12,595
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	25	94	284
Interest cost	1,741	1,810	2,478
Expected return on plan assets	0	0	0
Curtailment credit	0	0	(103)
Amortization of prior service cost (credit)	(9,641)	(9,708)	(9,343)
Amortization of actuarial loss	2,186	3,209	3,127
Net periodic cost (benefit)	$ (5,689)	$ (4,595)	$ (3,557)