Employee Benefit Plans (Components Of Pension Expense) (Details) (Pension Plans, Defined Benefit, USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Pension Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 3,548	$ 4,062	$ 6,375	$ 6,633
Interest cost	5,646	7,398	10,142	11,905
Expected return on assets	(6,755)	(8,422)	(12,134)	(14,353)
Amortization of prior service cost	52	66	105	105
Amortization of net actuarial loss	2,738	1,582	5,475	3,191
Total pension expense	$ 5,229	$ 4,686	$ 9,963	$ 7,481