Income Taxes (Schedule Of Reconciliation Of Beginning And Ending Amount Of Unrecognized Tax Benefits ) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Beginning of year	$ 2,483,000	$ 2,411,000	$ 2,435,000
Additions based on tax positions related to the current year	1,105,000	900,000	465,000
Additions for tax positions in prior years	208,000	76,000	143,000
Reductions for tax positions in prior years	(78,000)	(35,000)	0
Reductions as a result of completed audit examinations	(1,242,000)	0	0
Reductions as a result of a lapse of the applicable statute of limitations	0	(869,000)	(632,000)
End of year	$ 2,476,000	$ 2,483,000	$ 2,411,000