Employee Benefit Plans (Components Of Net Periodic Benefit Expense (Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligation	$ 17,506	$ 17,542	$ 52,517	$ 52,626
Expected return on plan assets	(22,831)	(21,102)	(68,493)	(63,308)
Amortization of actuarial loss	4,568	4,858	13,704	14,574
Amortization of prior service credit	418	4	1,253	11
Net periodic benefit expense (income)	(339)	1,302	(1,019)	3,903
Non-Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligation	803	860	2,410	2,579
Amortization of actuarial loss	280	240	839	763
Amortization of prior service credit	1	0	4	0
Net periodic benefit expense (income)	1,084	1,100	3,253	3,342
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	370	419	1,112	1,259
Interest cost on benefit obligation	869	1,080	2,608	3,239
Amortization of prior service credit	(263)	(302)	(789)	(905)
Net periodic benefit expense (income)	$ 976	$ 1,197	$ 2,931	$ 3,593