Income Taxes (Reconciliation Of Beginning And Ending Amount 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,	$ 4,085	$ 3,417	$ 5,183
Additions based on tax positions related to current year	2,785
Additions for tax positions of prior years	215	668	773
Reductions for tax positions of prior years			(2,539)
Balance at December 31,	$ 7,085	$ 4,085	$ 3,417