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Employee Benefits (Details) (USD $)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Compensation and Retirement Disclosure [Abstract] | |||
| Employer matching contribution percent | 100.00% | ||
| Employer matching percent | 6.00% | ||
| Employer contributions | $ 3,604,741 | $ 2,859,197 | $ 2,597,135 |
| X | ||||||||||
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- Definition
Defined Contribution Plan, Employer Matching Contribution, Percent of Match No definition available.
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- Details
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- Definition
The amount of the cost recognized during the period for defined contribution plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. No definition available.
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