Employee Benefit Plans (Components Of Net Periodic Benefit Expense (Income)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets	7.65%
Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligation		$ 71,308	$ 69,136	$ 69,857
Expected return on plan assets		(85,935)	(75,039)	(60,527)
Amortization of actuarial loss (gain)		10,546	9,071	17,235
Net periodic benefit expense (income)		(4,081)	3,168	26,565
Actuarial loss (gain)	19,300			(192,798)
Amortization of actuarial loss (gain)		(10,546)	(9,071)	(17,235)
Loss (gain) recognized in other comprehensive income or loss		246,025	68,130	(210,033)
Discount rate		5.55%	6.05%	6.10%
Discount rate - curtailment				7.85%
Expected long-term rate of return on plan assets		8.00%	8.50%	8.50%
Non-Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligation		3,787	3,879	4,203
Amortization of actuarial loss (gain)		678	452	(2,366)
Net periodic benefit expense (income)		4,465	4,331	1,837
Actuarial loss (gain)	900	7,587		(6,419)
Amortization of actuarial loss (gain)		(678)	(452)	2,366
Loss (gain) recognized in other comprehensive income or loss		$ 6,909	$ 3,767	$ (4,053)
Discount rate		5.55%	6.05%	6.10%
Discount rate - curtailment				7.85%
Expected long-term rate of return on plan assets