Employee Benefit Plan

12 Months Ended

Dec. 31, 2018

Retirement Benefits [Abstract]

Employee Benefit Plan

16. Employee Benefit Plan

NMM has a qualified 401(k) plan that covers substantially all employees who have completed at least six months of service and meet minimum age requirements. Participants may contribute a portion of their compensation to the plan, up to the maximum amount permitted under Section 401(k) of the Internal Revenue Code. Participants become fully vested after six years of service. NMM matches a portion of the participants’ contributions. NMM’s matching contributions for the years ended December 31, 2018 and 2017 were approximately $0.2 million.