Employee Benefit Plans (Components Of Pension Expense) (Details) (Pension Plans, Defined Benefit, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Pension Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 4,012	$ 3,316	$ 10,387	$ 9,949
Interest cost	7,151	5,953	17,293	17,858
Expected return on assets	(8,637)	(7,178)	(20,770)	(21,530)
Amortization of prior service cost	53	53	158	158
Amortization of net actuarial loss	2,796	1,596	8,270	4,786
Total pension expense	$ 5,375	$ 3,740	$ 15,338	$ 11,221