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Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Dec. 31, 2016
Employee Benefit Plan
Employee Benefit Plan	13. Employee Benefit Plan The Company maintains a defined contribution or 401(k) Plan for its qualified U.S. employees. Participants may contribute a percentage of their compensation on a pre-tax basis, subject to a maximum annual contribution imposed by the Internal Revenue Code. The Company may make discretionary matching contributions as well as discretionary profit-sharing contributions to the 401(k) Plan. The Company contributed $3.4 million, $3.3 million and $3.2 million to the 401(k) Plan during fiscal 2016, 2015 and 2014, respectively.