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Stock-Based Compensation (Summary Of Restricted Stock Activity) (Details) (USD $)
In Thousands, except Share data
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Stock-Based Compensation  
Restricted stock, Shares, Beginning Balance1,478,0001,235,505
Restricted stock, Fair Market Value at Date of Grant, Beginning Balance$ 30,600$ 24,718
Restricted stock, Shares, Granted575,694573,440
Restricted stock, Granted, Fair Market Value at Date of Grant16,00512,693
Restricted stock, Shares, Vested(219,469)(318,350)
Restricted stock, Vested, Fair Market Value at Date of Grant(5,608)(6,563)
Restricted stock, Shares, Cancellations(4,340)(12,595)
Restricted stock, Cancellations, Fair Market Value at Date of Grant(96)(248)
Restricted stock, Shares, Ending Balance1,829,8851,478,000
Restricted stock, Fair Market Value at Date of Grant, Ending Balance$ 40,901$ 30,600