0001172052 2019-05-01 2019-05-01 0001172052 false 8-K 2020-03-27 SAFETY INSURANCE GROUP, INC. DE 000-50070 13-4181699 20 Custom House Street Boston MA 02110 (617) 951-0600 false false false false false Common Stock, par value $0.01 per share SAFT NASDAQ