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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other Income/Expense - Net [Abstract]
Market value gains/(losses) on assets held in deferred compensation trust	$ (189)	$ 1,576	$ 2,346	$ 2,761
Loss on disposal of property and equipment	(101)	(80)	(180)	(228)
Interest income	192	291	1,165	401
Other - net	8	53	(19)	31
Total other income/(expense) - net	$ (90)	$ 1,840	$ 3,312	$ 2,965