Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity and Stock Based Compensation (Details 2)

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Stockholders' Equity and Stock Based Compensation (Details 2) (Options, USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2009
Options
     
Number of Options      
Outstanding at the beginning of the period (in shares) 374,140 392,890 392,890
Exercised (in shares) 63,500 18,750  
Outstanding at the end of the period (in shares) 310,640 374,140 392,890
Exercisable at the end of the period (in shares) 310,640 374,140  
Weighted Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 8.33 $ 8.12 $ 8.12
Exercised (in dollars per share) $ 6.78 $ 3.85  
Outstanding at the end of the period (in dollars per share) $ 8.65 $ 8.33 $ 8.12
Exercisable at the end of the period (in dollars per share) $ 8.65    
Aggregate Intrinsic Value      
Aggregate intrinsic value of options outstanding $ 0.9    
Aggregate intrinsic value of options exercisable $ 0.9    
Market value (in dollars per share) $ 11.09