Pension and Other Postretirement Employee Benefits (Components Of Net Periodic Cost (Benefit)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,531	$ 1,339	$ 3,061	$ 2,540
Interest cost	4,259	4,783	8,518	9,592
Expected return on plan assets	(5,192)	(6,126)	(10,383)	(12,256)
Amortization of prior service cost (credit)	152	187	303	374
Amortization of actuarial loss	4,408	3,606	8,816	7,226
Net periodic cost (benefit)	5,158	3,789	10,315	7,476
Other Postretirement Employee Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	(11)	11	12
Interest cost	345	372	728	871
Expected return on plan assets	0	0	0	0
Amortization of prior service cost (credit)	(2,328)	(2,410)	(4,656)	(4,820)
Amortization of actuarial loss	466	414	1,024	1,093
Net periodic cost (benefit)	$ (1,513)	$ (1,635)	$ (2,893)	$ (2,844)