Employee Benefit Plans (Components Of Pension Expense) (Details) (Defined Benefit Pension, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Defined Benefit Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 4,222	$ 2,827
Interest cost	5,895	4,496
Expected return on assets	(6,931)	(5,379)
Amortization of prior service cost	53	53
Amortization of net actuarial loss	4,251	2,737
Total pension expense	$ 7,490	$ 4,734