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 $)
6 Months Ended 12 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
2006 Plan
Restricted stock awards
Dec. 31, 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
Jun. 30, 2013
2012 Plan and 2006 Plan
Restricted stock awards
Shares                      
Nonvested shares at the beginning of the period                     251,150
Granted (in shares)     56,500 92,000 15,000 150,500 140,000 57,500 30,000 315,000 56,500
Vested (in shares)                     (53,375)
Nonvested shares at the end of the period                     254,275
Weighted Average Grant Date Fair Value                      
Nonvested shares at the beginning of period (in dollars per share)                     $ 11.24
Granted (in dollars per share)                     $ 12.79
Vested (in dollars per share)                     $ 10.33
Nonvested shares at the end of period (in dollars per share)                     $ 11.52
Unrecognized compensation cost (in dollars)                     $ 2,900,000
Weighted average period for recognition of unrecognized compensation cost                     3 years 2 months 12 days
Share-based compensation cost (in dollars) $ 551,000 $ 463,000