Employee Retirement And Other Post-Retirement Benefit Plans (Components Of Net Periodic Pension And Other Post-Retirement Benefit Costs Charged to Expense) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Pension Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 11	$ 20	$ 31	$ 60
Interest cost	35	42	105	128
Amortization of unrecognized prior service cost	4	29	11	83
(Gain) Loss amortization	(55)		(163)
Net periodic benefit costs	(5)	91	(16)	271
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	10	10
Interest cost	70	57	209	170
Amortization of unrecognized prior service cost		(1)	(1)	(3)
(Gain) Loss amortization	31	4	93	12
Curtailment benefit		(3)		(8)
Net periodic benefit costs	$ 104	$ 60	$ 311	$ 181