Employee Benefit Plans And Other Postretirement Benefits (Components Of Net Periodic Benefit Costs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension and SERPA Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 31,498	$ 35,987	$ 33,681
Interest cost	86,923	79,248	83,265
Expected return on plan assets	(136,734)	(127,327)	(117,110)
Prior service cost (credit)	1,119	1,746	2,958
Net loss	36,563	58,608	43,874
Settlement loss	0	0	6,242
Net periodic benefit cost	19,369	48,262	52,910
Postretirement Healthcare Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	7,015	7,858	7,413
Interest cost	16,878	15,599	18,310
Expected return on plan assets	(10,429)	(9,537)	(9,423)
Prior service cost (credit)	(3,853)	(3,853)	(3,853)
Net loss	4,729	8,549	7,421
Settlement loss	0	0	0
Net periodic benefit cost	$ 14,340	$ 18,616	$ 19,868