Employee Benefit Plans (Components Of Pension Expense) (Details) (Pension Plans, Defined Benefit [Member], USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 3,316	$ 2,760	$ 9,949	$ 9,431
Interest cost	5,953	5,192	17,858	17,738
Expected return on assets	(7,178)	(6,533)	(21,530)	(22,551)
Amortization of prior service cost	53	42	158	157
Amortization of net actuarial loss	1,596	771	4,786	2,851
Total pension expense	$ 3,740	$ 2,232	$ 11,221	$ 7,626