Employee Benefit Plans (Components Of Pension Expense) (Details) (Defined Benefit Pension, USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Defined Benefit Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 4,261	$ 3,548	$ 8,483	$ 6,375
Interest cost	6,409	5,646	12,304	10,142
Expected return on assets	(7,474)	(6,755)	(14,405)	(12,134)
Amortization of prior service cost	53	53	105	106
Amortization of net actuarial loss	4,241	2,737	8,493	5,474
Total pension expense	$ 7,490	$ 5,229	$ 14,980	$ 9,963