This excerpt taken from the MRO DEF 14A filed Mar 13, 2007.
The Committee also granted 20 percent of the intended long-term incentive value for Officers, other than Mr. Cazalot, in the form of time-based restricted stock. The Committee chose to grant time-based restricted stock for retention purposes and to diversify the mix of long-term compensation, which is consistent with competitive market practices. The restricted stock grants are also intended to help Officers increase their holdings in our stock.
The restricted stock awards will vest in full on the third anniversary of the date of grant. Prior to vesting, restricted stock recipients have voting rights and receive dividends on the restricted shares. If an Officer separates from service or retires prior to the end of the restriction period, the award is forfeited. In the event of the death of the Officer or upon a change in control, the award will fully vest.