b'KOSMOS ENERGY LTD.Notes to Consolidated Financial Statements (Continued)12. Equity-based Compensation (Continued)vest over a three year period. Restricted stock awards are issued and included in the number ofoutstanding shares upon the date of grant and, if such awards are forfeited, they become treasury stock.Upon vesting, restricted stock units become issued and outstanding stock.The following table reflects the outstanding restricted stock awards as of December 31, 2018:Weighted- Market / Service Weighted-Service Vesting Average Vesting AverageRestricted Stock Grant-Date Restricted Stock Grant-DateAwards Fair Value Awards Fair Value(In thousands) (In thousands)Outstanding at December 31, 2015: . . . . 810 $ 9.20 261 $ 9.44Granted . . . . . . . . . . . . . . . . . . . . . .Forfeited . . . . . . . . . . . . . . . . . . . . . (162) 9.44Vested . . . . . . . . . . . . . . . . . . . . . . . (322) 9.77 (99) 9.44Outstanding at December 31, 2016: . . . . 488 8.83Granted . . . . . . . . . . . . . . . . . . . . . .Forfeited . . . . . . . . . . . . . . . . . . . . .Vested . . . . . . . . . . . . . . . . . . . . . . . (268) 8.97Outstanding at December 31, 2017: . . . . 220 8.64Granted . . . . . . . . . . . . . . . . . . . . . .Forfeited . . . . . . . . . . . . . . . . . . . . .Vested . . . . . . . . . . . . . . . . . . . . . . . (220) 8.64Outstanding at December 31, 2018: . . . .The following table reflects the outstanding restricted stock units as of December 31, 2018:Weighted- Market / Service Weighted-Service Vesting Average Vesting AverageRestricted Stock Grant-Date Restricted Stock Grant-DateUnits Fair Value Units Fair Value(In thousands) (In thousands)Outstanding at December 31, 2015: . . . . 3,592 $ 9.79 6,578 $ 14.24Granted . . . . . . . . . . . . . . . . . . . . . . 2,158 4.05 1,379 4.88Forfeited . . . . . . . . . . . . . . . . . . . . . (134) 8.87 (70) 14.49Vested . . . . . . . . . . . . . . . . . . . . . . . (1,456) 9.61 (693) 15.81Outstanding at December 31, 2016: . . . . 4,160 6.91 7,194 12.29Granted . . . . . . . . . . . . . . . . . . . . . . 2,085 6.43 2,175 9.50Forfeited . . . . . . . . . . . . . . . . . . . . . (137) 6.91 (21) 6.21Vested . . . . . . . . . . . . . . . . . . . . . . . (1,925) 7.51 (896) 15.43Outstanding at December 31, 2017: . . . . 4,183 6.39 8,452 11.26Granted . . . . . . . . . . . . . . . . . . . . . . 2,402 7.07 8,111 12.38Forfeited . . . . . . . . . . . . . . . . . . . . . (229) 6.40 (302) 8.95Vested . . . . . . . . . . . . . . . . . . . . . . . (2,241) 6.95 (9,545) 13.75Outstanding at December 31, 2018: . . . . 4,115 6.42 6,716 9.02139'