Income Taxes (Schedule Of Reconciliation Of The Beginning And Ending Amount 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]
Gross unrecognized tax benefits, beginning of the year			$ 31,433
Additions for tax positions of prior years	1,894	1,518	838
Reductions for tax positions of prior years	(1,748)	(3,765)	(1,229)
Additions for tax positions related to the current year	2,764	2,231	3,059
Reductions due to settlements	(690)	(810)
Reductions due to lapse of applicable statute of limitations	(644)	(215)	(4,744)
Subtotal	29,892	28,316	29,357
Interest and penalties	4,532	3,892	4,578
Total gross unrecognized tax benefits, end of the year	$ 34,424