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Share Based and Deferred Compensation (Tables)
 6 Months Ended
Jun. 30, 2011
Share Based and Deferred Compensation (Tables) [Abstract]  
Option activity
                                 
            Weighted     Weighted Average        
            Average     Remaining Contractual     Aggregate Intrinsic  
    Shares     Exercise Price     Term (in years)     Value  
Outstanding at January 1, 2011
    3,116,611     $ 14.56       7.81     $ (9,080,625 )
Granted
    603,241       11.89       9.68       (180,972 )
Exercised
    (76,887 )     2.91                  
 
                       
 
                               
Outstanding at June 30, 2011
    3,642,965     $ 14.37       7.70     $ (10,115,971 )
 
                             
 
                               
Vested/Exercisable at June 30, 2011
    2,331,021     $ 16.75       7.05     $ (11,802,863 )
Company's restricted share activity
                 
            Weighted  
            Average Grant  
    Shares     Date Fair value  
Non-vested at January 1, 2011
    851,278     $ 10.75  
Granted
    197,035       11.92  
Vested
    (237,541 )     19.76  
Forfeited
    (2,009 )     15.04  
 
           
Non-vested at June 30, 2011
    808,763     $ 9.47