Many employers today are quite pleased when they hire boomeranges, the term that is now often used to describe employees who leave a company and then return. Although you are concerned that employees who left may be inclined to leave twice, many companies have found that returning employees are actually less likely to leave than the general employee population. There are other advantages associated with rehiring these individuals. For example, with a rehire, you know what you are getting. You do not need to rely on an applicant's proclamations or limited references. Rather, you can rely on actual performance data from your own company.
These employees can also be internal ambassadors for the company, as they are likely to tell their fellow employees about the realities of working elsewhere, as well as the realities of today's job market, and this can actually help reduce turnover among other members of the staff. On a broader basis, the practice of rehiring former employees also indicates that management is neither petty nor vindictive. If you had an excellent employee who left for greener pastures that were not so green, you could miss out on a real asset if you refuse to catch this boomerang. | 
