Employee Benefit Plans (Components Of Pension Expense) (Details) (Pension Plans, Defined Benefit [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 2,827	$ 2,571
Interest cost	4,496	4,507
Expected return on assets	(5,379)	(5,535)
Amortization of prior service cost	53	39
Amortization of net actuarial loss	2,737	1,213
Total pension expense	$ 4,734	$ 2,795