b'KOSMOS ENERGY LTD.Notes to Consolidated Financial Statements (Continued)14. Net Income (Loss) Per Share (Continued)participating securities represents the distributed and undistributed earnings attributableto the participating securities. Our restricted stock awards with market and service vestingcriteria and all restricted stock units are not considered to be participating securities and,therefore, are excluded from the basic net income (loss) per share calculation. Ourservice vesting restricted stock awards do not participate in undistributed net lossesbecause they are not contractually obligated to do so and, therefore, are excluded fromthe basic net income (loss) per share calculation in periods we are in a net loss position.All restricted stock awards were fully vested in January 2018.(2) For the years ended December 31, 2018, 2017 and 2016, we excluded 10.6 million,12.9 million and 11.8 million outstanding restricted stock awards and restricted stockunits, respectively, from the computations of diluted net income per share because theeffect would have been anti-dilutive.15. Commitments and ContingenciesFrom time to time, we are involved in litigation, regulatory examinations and administrativeproceedings primarily arising in the ordinary course of our business in jurisdictions in which we dobusiness. Although the outcome of these matters cannot be predicted with certainty, managementbelieves none of these matters, either individually or in the aggregate, would have a material effectupon the Companys financial position; however, an unfavorable outcome could have a material adverseeffect on our results from operations for a specific interim period or year.The Jubilee Field in Ghana covers an area within both the WCTP and DT petroleum contractareas. It was agreed the Jubilee Field would be unitized for optimal resource recovery. Kosmos and itspartners executed a comprehensive unitization and unit operating agreement, the Jubilee UUOA, tounitize the Jubilee Field and govern each partys respective rights and duties in the Jubilee Unit, whichwas effective July 16, 2009. Pursuant to the terms of the Jubilee UUOA, the tract participations aresubject to a process of redetermination. The initial redetermination process was completed onOctober 14, 2011. As a result of the initial redetermination process, our Unit Interest is 24.1%. Theseconsolidated financial statements are based on these redetermined tract participations. Our unit interestmay change in the future should another redetermination occur.The Company leases facilities under various operating leases that fully expire through 2027,including our office space. Rent expense under these agreements, was $4.7 million, $3.3 million and$3.3 million for the years ended December 31, 2018, 2017 and 2016, respectively.We currently have a commitment to drill one exploration well in Mauritania and Namibia and twoexploration wells in Senegal. Our partner is obligated to fund our share of the cost of the explorationwells, subject to the remaining exploration and appraisal carry covering both our Mauritania andSenegal blocks. In Sao Tome and Principe, we have a 3D seismic requirement of approximately13,500 square kilometers.145'