Benefit Plans (Component Of Net Periodic Pension Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Benefit Plans [Abstract]
Net actuarial loss	$ 45,487	$ 25,805
Prior service cost	1,982	2,351
Deferred tax benefit	(19,903)	(11,812)
Total	$ 27,566	$ 16,344