Employee Benefit Plans (Summary Of Pension Plans Funded Status) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Projected benefit obligation at prior valuation date	$ 103,857	$ 98,148
Service cost	406	716	683
Interest cost	5,366	5,505	5,473
Actuarial (gain) loss	5,323	4,256
Projected benefit obligation at valuation date	110,186	103,857	98,148
Fair value of plan assets at prior valuation date	98,824	93,498
Actual return (loss) on plan assets	3,152	10,084
Employer contributions	18	10
Fair value of plan assets at valuation date	97,228	98,824	93,498
Funded status and net amount recognized at valuation date	(12,958)	(5,033)
Projected Benefit Obligation [Member]
Benefits paid	(4,766)	(4,768)
Plan Assets [Member]
Benefits paid	$ (4,766)	$ (4,768)