Employee Benefit 401(k) Plans (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | |
|---|---|---|
Sep. 30, 2011 | Sep. 30, 2010 | |
| Employee Benefit 401(k) Plans [Abstract] | ||
| Maximum employee subscription rate, percentage of compensation | 60.00% | |
| Minimum employee subscription rate, percentage of compensation | 1.00% | |
| Employee's 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. | |
| Expenses for employee benefit plan | $ 0 | $ 0 |
| Employer contribution to employee benefit plan | $ 0 | $ 0 |