Income Taxes (Schedule 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]
Beginning Balance, January 1	$ 4,500	$ 5,036	$ 8,000
Additions based on tax provisions taken during a prior period	61	208	352
Reductions based on tax provisions taken during a prior period	(23)	(17)	(1,383)
Additions based on tax provisions taken during the current period	291	359	521
Reductions related to settlement of tax matters	(894)	(377)	(1,137)
Reductions related to lapses of applicable statutes of limitation	(561)	(709)	(1,317)
Ending Balance, December 31	$ 3,374	$ 4,500	$ 5,036