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Stock-Based Compensation (Summary Of Restricted Stock Activity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stock-Based Compensation [Abstract]      
Restricted stock, Shares, Beginning Balance 1,478,000 1,235,505 1,038,270
Restricted stock, Fair Market Value at Date of Grant, Beginning Balance $ 30,600 $ 24,718 $ 23,023
Restricted stock, Shares, Granted 575,694 573,440 444,985
Restricted stock, Granted, Fair Market Value at Date of Grant 16,005 12,693 6,995
Restricted stock, Shares, Vested (229,979) (318,350) (237,370)
Restricted stock, Vested, Fair Market Value at Date of Grant (5,816) (6,563) (5,079)
Restricted stock, Shares, Cancellations (5,970) (12,595) (10,380)
Restricted stock, Cancellations, Fair Market Value at Date of Grant (134) (248) (221)
Restricted stock, Shares, Ending Balance 1,817,745 1,478,000 1,235,505
Restricted stock, Fair Market Value at Date of Grant, Ending Balance $ 40,655 $ 30,600 $ 24,718