Employee Retirement Plans (Components Of Net Periodic Pension And Other Post-Retirement Benefit Costs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Employee Retirement Plans [Abstract]
Service cost	$ 41	$ 80	$ 111
Interest cost	141	171	175
Amortization of unrecognized prior service cost	15	110	67
Gain amortization	(218)
Net periodic pension (income) cost	$ (21)	$ 361	$ 353
Discount rate	4.50%	5.50%	5.75%