Employee Benefit Plans (Components Of Net Periodic Benefit Expense (Income)) (Details) (USD $) In Thousands, unless otherwise specified	2 Months Ended			10 Months Ended			12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligation							$ 75,030	$ 70,022	$ 70,168
Expected return on plan assets							(93,085)	(91,324)	(84,411)
Amortization of actuarial loss (gain)							9,642	18,272	19,432
Amortization of prior-service costs (credit)							1,619	1,670	14
Curtailment loss							0	1,197	0
Settlement loss							15,965	0	0
Net periodic benefit expense (income)							9,171	(163)	5,203
Actuarial loss (gain)							136,142	(238,037)	(720)
Prior-service cost							0	0	44,961
Reclassification of actuarial loss to net periodic benefit expense (income)							(25,607)	(18,272)	(19,432)
Reclassification of prior-service credit to net periodic benefit expense (income)							(1,619)	(2,867)	(14)
Loss (gain) recognized in other comprehensive income or loss							108,916	(259,176)	24,795
Discount rate							5.05%	4.25%	4.65%
Expected long-term rate of return on plan assets							6.53%	7.10%	7.65%
Non-Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligation							3,451	3,213	3,438
Expected return on plan assets							0	0	0
Amortization of actuarial loss (gain)							876	1,118	958
Amortization of prior-service costs (credit)							5	5	0
Curtailment loss							0	0	44
Settlement loss							0	0	0
Net periodic benefit expense (income)							4,332	4,336	4,440
Actuarial loss (gain)							9,182	(5,508)	3,574
Prior-service cost							0	0	109
Reclassification of actuarial loss to net periodic benefit expense (income)							(876)	(1,118)	(1,002)
Reclassification of prior-service credit to net periodic benefit expense (income)							(5)	(5)	0
Loss (gain) recognized in other comprehensive income or loss							8,301	(6,631)	2,681
Discount rate							5.05%	4.25%	4.65%
Expected long-term rate of return on plan assets							0.00%	0.00%	0.00%
Postretirement Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost							950	1,459	1,679
Interest cost on benefit obligation							2,734	3,434	4,318
Amortization of actuarial loss (gain)							(2,111)	(1)	0
Amortization of prior-service costs (credit)							(2,863)	(1,457)	(1,206)
Net periodic benefit expense (income)							(1,290)	3,435	4,791
Actuarial loss (gain)							8,918	(21,143)	1,979
Prior-service cost							0	(19,243)	0
Reclassification of actuarial gain to net periodic benefit expense							2,111	1	0
Reclassification of prior-service credit to net periodic benefit expense							2,863	1,457	1,206
Loss (gain) recognized in other comprehensive income or loss							$ 13,892	$ (38,928)	$ 3,185
Discount rate	4.50%	4.25%	4.30%	4.50%	3.60%	4.30%