Income Taxes (Summary Of Activity In Unrecognized Tax Benefits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning balance	$ 21,692	$ 24,760	$ 11,013
Additions based on tax positions related to current year			36
Additions based on tax positions related to prior years	6,873	871	16,607
Reductions based on tax positions related to prior years	(2,166)	(3,939)	(2,896)
Unrecognized tax benefits, ending balance	$ 26,399	$ 21,692	$ 24,760