Stockholders' Equity and Stock Based Compensation (Details 3) (USD $)
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3 Months Ended | 12 Months Ended | 3 Months Ended | ||||||||
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Mar. 31, 2013
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Mar. 31, 2012
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Mar. 31, 2013
2006 Plan
Restricted stock awards
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Dec. 31, 2012
2006 Plan
Restricted stock awards
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Dec. 31, 2011
2006 Plan
Restricted stock awards
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Dec. 31, 2010
2006 Plan
Restricted stock awards
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Dec. 31, 2009
2006 Plan
Restricted stock awards
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Dec. 31, 2008
2006 Plan
Restricted stock awards
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Dec. 31, 2007
2006 Plan
Restricted stock awards
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Dec. 31, 2006
2006 Plan
Restricted stock awards
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Mar. 31, 2013
2012 Plan and 2006 Plan
Restricted stock awards
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Shares | |||||||||||
Nonvested shares at the beginning of the period | 251,150 | ||||||||||
Granted (in shares) | 40,000 | 92,000 | 15,000 | 150,500 | 140,000 | 57,500 | 30,000 | 315,000 | 40,000 | ||
Vested (in shares) | (26,275) | ||||||||||
Nonvested shares at the end of the period | 264,875 | ||||||||||
Weighted Average Grant Date Fair Value | |||||||||||
Nonvested shares at the beginning of period (in dollars per share) | $ 11.24 | ||||||||||
Granted (in dollars per share) | $ 13.14 | ||||||||||
Vested (in dollars per share) | $ 10.31 | ||||||||||
Nonvested shares at the end of period (in dollars per share) | $ 11.37 | ||||||||||
Unrecognized compensation cost (in dollars) | $ 3,000,000 | ||||||||||
Weighted average period for recognition of unrecognized compensation cost | 3 years 3 months 18 days | ||||||||||
Share-based compensation cost (in dollars) | $ 271 | $ 231 |