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Stockholders' Equity (Summary Of Restricted Stock Activity) (Details) (Restricted stock [Member], USD $)
3 Months Ended
Mar. 31, 2013
Restricted stock [Member]
 
Number of Shares [Roll Forward]  
Outstanding, Number of Shares, Beginning Balance 81,651
Granted, Number of Shares 0
Forfeited, Number of Shares (4,294)
Vested, number of shares (17,424)
Outstanding, Number of Shares, Ending Balance 59,933
Weighted Average Fair Value Per Share [Roll Forward]  
Outstanding, weighted average fair value per share, beginning of period $ 31.45
Granted, weighted average fair value per share $ 0.00
Forfeited, Weighted Average Fair Value Per Share $ 31.52
Vested, Weighted Average Fair Value Per Share $ 31.77
Non-vested, weighted average fair value per share, end of period $ 31.35
Vested, aggregate intrinsic value $ 535,962