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Stock-Based Compensation (Summary Of Restricted Stock Activity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Stock-Based Compensation [Abstract]    
Restricted stock, Shares, Beginning Balance 1,817,745 1,478,000
Restricted stock, Fair Market Value at Date of Grant, Beginning Balance $ 40,655 $ 30,600
Restricted stock, Shares, Granted   200,000
Restricted stock, Granted, Fair Market Value at Date of Grant   5,796
Restricted stock, Shares, Vested (70,206) (1,970)
Restricted stock, Vested, Fair Market Value at Date of Grant (2,007) (41)
Restricted stock, Shares, Cancellations (2,940) (1,150)
Restricted stock, Cancellations, Fair Market Value at Date of Grant (60) (24)
Restricted stock, Shares, Ending Balance 1,744,599 1,674,880
Restricted stock, Fair Market Value at Date of Grant, Ending Balance $ 38,588 $ 36,331