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		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Pension Benefit [Member]
Service cost	$ 9	$ 20	$ 20	$ 40
Interest cost	35	43	70	86
Amortization of unrecognized prior service cost	3	27	7	54
(Gain) Loss amortization	(53)		(108)
Net periodic benefit costs	(6)	90	(11)	180
Other Post-Retirement Benefits [Member]
Service cost	4	(9)	7	7
Interest cost	69	45	139	113
Amortization of unrecognized prior service cost	(1)		(1)	(2)
(Gain) Loss amortization	31	(6)	62	8
Curtailment benefit		(5)		(5)
Net periodic benefit costs	$ 103	$ 25	$ 207	$ 121