12. Employee Benefit Plan

We maintain a defined contribution benefit plan in compliance with Section 401(k) of the IRC (the “401(k) Plan”), which covers those employees who meet the 401(k) Plan’s eligibility requirements. During 2013, 2012 and 2011, the Company’s matching contribution was 100% of each participant’s contribution up to a maximum of 6% for 2013 and 2012 and 5% for 2011 of the participant’s eligible compensation, subject to limitations imposed by the IRC. The 401(k) Plan provides 100% vesting in Company match contributions on a pro rata basis over five years of service (20% per year). Our expenses relating to the 401(k) Plan were $2.1 million, $2.1 million and $1.8 million for 2013, 2012 and 2011, respectively.