Employee Benefit Plans (Components Of Net Periodic Benefit Expense (Income)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets	7.10%
Postretirement Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost		$ 1,679	$ 1,441	$ 1,405
Interest cost on benefit obligation		4,318	4,492	4,832
Prior-service credits amortized	1,100	(1,206)	(1,212)	(1,202)
Net periodic benefit expense (income)		4,791	4,721	5,035
Actuarial loss (gain)		1,979	3,493	2,354
Plan amendments		0	0	(198)
Loss (gain) recognized in other comprehensive income or loss		3,185	4,705	3,358
Discount rate		4.30%	5.00%	5.65%
Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligation		70,168	71,308	69,136
Expected return on plan assets		(84,411)	(85,935)	(75,039)
Amortization of actuarial loss (gain)		19,432	10,532	9,057
Prior-service credits amortized		14	14	14
Defined Benefit Plan, Settlements, Benefit Obligation		0	0	0
Net periodic benefit expense (income)		5,203	(4,081)	3,168
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized (Gain) Loss Arising During Period, Net of Tax		(720)	256,571	77,201
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, before Tax		44,961	0	0
Amortization of actuarial loss and settlement loss		(19,432)	(10,532)	(9,057)
Actuarial loss (gain)		(85,755)	(183,293)
Plan amendments		44,961	0
Loss (gain) recognized in other comprehensive income or loss		24,795	246,025	68,130
Discount rate		4.65%	5.55%	6.05%
Expected long-term rate of return on plan assets		7.65%	8.00%	8.50%
Non-Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligation		3,438	3,787	3,879
Expected return on plan assets		0	0	0
Amortization of actuarial loss (gain)		958	678	452
Prior-service credits amortized		0	0	0
Defined Benefit Plan, Settlements, Benefit Obligation		44	0	0
Net periodic benefit expense (income)		4,440	4,465	4,331
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized (Gain) Loss Arising During Period, Net of Tax		3,574	7,587	4,219
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, before Tax		109	0	0
Amortization of actuarial loss and settlement loss		(1,002)	(678)	(452)
Actuarial loss (gain)		(3,574)	(7,587)
Plan amendments		109	0
Loss (gain) recognized in other comprehensive income or loss		$ 2,681	$ 6,909	$ 3,767
Discount rate		4.65%	5.55%	6.05%
Expected long-term rate of return on plan assets		0.00%	0.00%	0.00%