Employee Benefit Plans And Other Postretirement Benefits (Schedule Of Obligation And Funded Status) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension and SERPA Benefits [Member]
Change in benefit obligation
Benefit obligation, beginning of period	$ 1,871,575	$ 1,570,930
Service cost	35,987	33,681	37,341
Interest cost	79,248	83,265	80,805
Actuarial (gains) losses	(199,408)	276,069
Plan participant contributions	0	1,459
Benefits paid, net of Medicare Part D subsidy	(72,752)	(93,829)
Benefit obligation, end of period	1,714,650	1,871,575	1,570,930
Change in plan assets:
Fair value of plan assets, beginning of period	1,539,018	1,253,916
Actual return on plan assets	277,388	160,731
Company contributions	176,947	216,741
Plan participant contributions	0	1,459
Benefits paid	(72,752)	(93,829)
Fair value of plan assets, end of period	1,920,601	1,539,018	1,253,916
Funded status of the plans, December 31	205,951	(332,557)
Prepaid benefit costs (long-term assets)	244,871	0
Accrued benefit liability (current liabilities)	(2,549)	(2,263)
Accrued benefit liability (long-term liabilities)	(36,371)	(330,294)
Net amount recognized	205,951	(332,557)
Postretirement Healthcare Benefits [Member]
Change in benefit obligation
Benefit obligation, beginning of period	403,227	380,625
Service cost	7,858	7,413	7,630
Interest cost	15,599	18,310	19,644
Actuarial (gains) losses	(33,729)	23,367
Plan participant contributions	2,609	1,561
Benefits paid, net of Medicare Part D subsidy	(29,040)	(28,049)
Benefit obligation, end of period	366,524	403,227	380,625
Change in plan assets:
Fair value of plan assets, beginning of period	123,106	109,160
Actual return on plan assets	24,769	13,946
Company contributions	27,849	27,675
Plan participant contributions	2,609	1,561
Benefits paid	(30,458)	(29,236)
Fair value of plan assets, end of period	147,875	123,106	109,160
Funded status of the plans, December 31	(218,649)	(280,121)
Prepaid benefit costs (long-term assets)	0	0
Accrued benefit liability (current liabilities)	(2,484)	(2,059)
Accrued benefit liability (long-term liabilities)	(216,165)	(278,062)
Net amount recognized	$ (218,649)	$ (280,121)