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Income Tax Expense (Schedule 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 Tax Expense [Abstract]      
Unrecognized tax benefits, Beginning Balance $ 733 $ 917 $ 2,391
Additions for tax positions of prior years 200 333 200
Reductions as a result of settlements with tax authorities (200) (200) (1,474)
Decreases for tax positions of prior years (133) (317) (200)
Unrecognized tax benefits, Ending Balance $ 600 $ 733 $ 917