| Id | Content |
|---|---|
| F1 | Represents shares withheld by the issuer to cover tax withholding obligations upon vesting of a restricted stock award. |
| F2 | Represents shares of time-based restricted stock which vest in substantially three equal annual installments commencing on the first anniversary of the grant date. |
| F3 | Represents shares of performance-based restricted stock which vest depending upon level of attainment of predetermined performance measures at the end of two-year and three-year performance periods. |