Other Income/(Expense) - Net (Schedule Of Other Income - Net Comprises) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Other Income/(Expense) - Net [Abstract]
Market value gains/(losses) on assets held in deferred compensation trust	$ 1,576	$ (2,011)	$ 2,761	$ 796
Loss on disposal of property and equipment	(80)	(79)	(228)	(68)
Interest income	291	74	401	197
Other - net	53	81	31	(44)
Other income/(expense)- net	$ 1,840	$ (1,935)	$ 2,965	$ 881