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Share-Based Compensation Plans (Details 1) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Time Based Awards [Member]
      
Common shares, Non-vested as of December 31, 2011 991,660    
Common shares, Granted 375,980    
Common shares, Vested (443,646)    
Common shares, Forfeited (81,164)    
Common shares, Non-vested as of December 31, 2012 842,830 991,660  
Weighted average grant date fair value, Non-vested as of December 31, 2011 $ 7.11    
Weighted average grant date fair value, Granted $ 9.95 $ 15.79 $ 6.92
Weighted average grant date fair value, Vested $ 2.86    
Weighted average grant date fair value, Forfeited $ 10.29    
Weighted average grant date fair value, Non-vested as of December 31, 2012 $ 10.31 $ 7.11  
Performance Based Awards [Member]
      
Common shares, Non-vested as of December 31, 2011 419,100    
Common shares, Granted 277,200    
Common shares, Vested 0    
Common shares, Forfeited (60,450)    
Common shares, Non-vested as of December 31, 2012 635,850    
Weighted average grant date fair value, Non-vested as of December 31, 2011 $ 10.65    
Weighted average grant date fair value, Granted $ 10.87    
Weighted average grant date fair value, Vested $ 0    
Weighted average grant date fair value, Forfeited $ 10.20    
Weighted average grant date fair value, Non-vested as of December 31, 2012 $ 10.78