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Stockholders' Equity and Stock Based Compensation (Details 3) (USD $)
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6 Months Ended | 12 Months Ended | 6 Months Ended | ||||||||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 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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Jun. 30, 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) | 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 | |||||||||
| X | ||||||||||
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- Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate unrecognized cost of share-based awards, other than options, made to employees under an equity-based compensation plan, that have yet to vest. No definition available.
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| X | ||||||||||
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- Definition
The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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