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Employee Benefit 401(k) Plans (Details) (USD $)
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9 Months Ended | |
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Sep. 30, 2012
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Sep. 30, 2011
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| Minimum employee subscription rate, percentage of compensation | 1.00% | |
| Maximum employee subscription rate, percentage of compensation | 60.00% | |
| Employee pre-tax contributions vested percentage | 100.00% | |
| Vesting rate | 20.00% | |
| Percentage vested after total service period | 100.00% | |
| Employees' vesting rights | Participants are always 100 percent vested in their pre-tax contributions and will begin vesting in any matching or profit sharing contributions made on their behalf after two years of service with the Company at a rate of 20 percent per year, becoming 100 percent vested after a total of six years of service with the Company. | |
| Employer contribution to employee benefit plan | $ 0 | $ 0 |
| Expenses for employee benefit plan | $ 0 | $ 0 |
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Maximum [Member]
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| Employer contribution vesting period | 6 years | |
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Minimum [Member]
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| Employer contribution vesting period | 2 years | |