Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity and Stock Based Compensation (Details 3)

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Stockholders' Equity and Stock Based Compensation (Details 3) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
2006 Plan
Restricted stock awards
Dec. 31, 2011
2006 Plan
Restricted stock awards
Dec. 31, 2010
2006 Plan
Restricted stock awards
Dec. 31, 2009
2006 Plan
Restricted stock awards
Dec. 31, 2008
2006 Plan
Restricted stock awards
Dec. 31, 2007
2006 Plan
Restricted stock awards
Dec. 31, 2006
2006 Plan
Restricted stock awards
Shares                  
Nonvested shares at the beginning of the period     262,275            
Granted (in shares)     72,000 15,000 150,500 140,000 57,500 30,000 315,000
Vested (in shares)     (73,950)            
Forfeited (in shares)     (3,525) (8,375) (5,875)   (3,500) (12,500)  
Nonvested shares at the end of the period     256,800 262,275          
Weighted Average Grant Date Fair Value                  
Nonvested shares at the beginning of period (in dollars per share)     $ 10.44            
Granted (in dollars per share)     $ 12.70            
Vested (in dollars per share)     $ 10.05            
Forfeited (in dollars per share)     $ 11.79            
Nonvested shares at the end of period (in dollars per share)     $ 11.16 $ 10.44          
Unrecognized compensation cost (in dollars)     $ 2,900,000            
Weighted average period for recognition of unrecognized compensation cost     3 years 6 months            
Share-based compensation cost (in dollars) $ 743,000 $ 824,000