Other Income/(Expense) - Net (Schedule Of Other Income - Net Comprises) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Other Income/(Expense) - Net [Abstract]
Market value gains/(losses) on assets held in deferred compensation trust	$ (948)	$ 743	$ 1,185	$ 2,807
Gain/(loss) on disposal of property and equipment	(67)	32	(148)	11
Interest income	59	62	110	123
Other - net	(14)	(123)	(22)	(125)
Other income/(expense)- net	$ (970)	$ 714	$ 1,125	$ 2,816