Employee Retirement Plans (Schedule Of Funded Status) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Employee Retirement Plans [Abstract]
Projected benefit obligation at January 1	$ 2,730	$ 3,131	$ 2,989
Service cost	41	80	111
Interest cost	141	171	175
Prior service cost			125
Actuarial losses (gains)	93	(328)	(87)
Benefits paid	(352)	(324)	(182)
Projected benefit obligation at December 31	2,653	2,730	3,131
Under funded status	(2,653)	(2,730)	(3,131)
Unamortized prior service cost	67	82	192
Unrecognized actuarial loss	(180)	(490)	(162)
Net amount recognized	$ (2,766)	$ (3,138)	$ (3,101)