Income Taxes (Summary Of 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 at January 1	$ 4,553	$ 8,500	$ 7,513
Additions based on tax positions related to the current year	4	3,806	7,293
Reductions due to statute of limitations expiring	(412)	(3,440)	(5,186)
Reductions for tax positions of prior years	0	(4,313)	(1,120)
Balance at December 31	$ 4,145	$ 4,553	$ 8,500