Income Taxes (Reconciliation Of 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]
Balance, beginning of period	$ 60,439	$ 49,652	$ 27,575
Additions for tax positions taken in a prior year	663	2,571	5,848
Additions for tax positions taken in the current year	6,752	10,333	17,589
Reductions for tax positions taken in the prior year	(1,936)	(257)	(894)
Reductions for tax positions taken in the prior year due to settlement	(600)	(1,350)	(203)
Reductions for tax positions taken in the prior year due to statutes lapsing	(217)	(510)	(263)
Balance, end of period	$ 65,101	$ 60,439	$ 49,652