Income Taxes (Schedule Of Reconciliation Of Gross Unrecognized Tax Benefits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Unrecognized Tax Benefits, Beginning Balance	$ 31,571	$ 30,023	$ 30,217
Additions based on tax positions related to the current year	1,779	4,487	1,074
Additions for tax positions of prior years	3,217	655
Reductions for tax positions of prior years	(5,013)
Reductions due to lapse of applicable statute of limitations	(16,720)	(3,394)
Settlements paid	(425)	(200)	(1,268)
Unrecognized Tax Benefits, Ending Balance	$ 14,409	$ 31,571	$ 30,023