Employee Benefit Plans (Amounts Included In Accumulated Other Comprehensive Loss That Have Not Yet Been Recognized In Net Periodic Benefit Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain (loss)		$ (413,879)	$ (670,188)
Prior-service credit (cost)		(42,428)	(45,295)
Amount included in accumulated other comprehensive loss, not yet recognized in net periodic benefit		(456,307)	(715,483)
Defined Benefit Plan, Future Amortization of Loss	9,902
Defined Benefit Plan, Future Amortization of Prior Service Cost	1,618
Non-Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain (loss)		(27,367)	(33,993)
Prior-service credit (cost)		(104)	(109)
Amount included in accumulated other comprehensive loss, not yet recognized in net periodic benefit		(27,471)	(34,102)
Defined Benefit Plan, Future Amortization of Loss	877
Defined Benefit Plan, Future Amortization of Prior Service Cost	5
Postretirement Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain (loss)		19,537	(1,605)
Prior-service credit (cost)		19,366	1,580
Amount included in accumulated other comprehensive loss, not yet recognized in net periodic benefit		38,903	(25)
Defined Benefit Plan, Future Amortization of Loss	2,626
Defined Benefit Plan, Future Amortization of Prior Service Cost	$ 2,863