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Stockholders' Equity (Summary Of Restricted Stock Units Activity) (Details) (Restricted Stock Units (RSUs) [Member], USD $)
3 Months Ended
Mar. 31, 2013
Restricted Stock Units (RSUs) [Member]
 
Number of Shares [Roll Forward]  
Outstanding, Number of Shares, Beginning Balance 2,423,612
Granted, Number of Shares 1,306,003
Forfeited, Number of Shares (150,843)
Vested, number of shares (676,149)
Outstanding, Number of Shares, Ending Balance 2,902,623
Vested and expected to vest, end of period, Number of Shares 2,473,162
Aggregate Intrinsic Value [Roll Forward]  
Outstanding, Aggregate Intrinsic Value, end of period $ 88,740,451
Vested and expected to vest, end of period, Aggregate Intrinsic Value $ 72,812,016