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Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Dec. 31, 2016
Employee Benefit Plan
Employee Benefit Plan	5.Employee Benefit Plan The Company sponsors the Safety Insurance Company 401(k) qualified defined contribution retirement plan (the “Retirement Plan”). The Retirement Plan is available to all eligible employees of the Company. An employee must be 21 years of age to be eligible to participate in the Retirement Plan and is allowed to contribute on a pre‑tax basis up to the maximum allowed under federal law. The Retirement Plan is administered by the Company and is subject to the provisions of the Employee Retirement Income Security Act of 1974. At the close of each Retirement Plan year, the Company makes a matching contribution equal to 100% of the amount each participant contributed during the plan year from their total pay, up to a maximum amount of 8% of the participant’s base salary, to those participants who have contributed to the Retirement Plan and were employed on the last day of the Retirement Plan year. Compensation expense related to the Retirement Plan was $3,018, $3,019, and $2,775 for the years ended December 31, 2016, 2015, and 2014, respectively.