Shares of Domino's Pizza (NYSE: DPZ) rallied more than 40% this year, making it a standout performer among restaurant stocks. Domino's started 2018 on shaky ground after CEO Patrick Doyle, who led the pizza chain's turnaround, announced that he would resign in June.Yet Domino's continued to win over investors by maintaining its streak of solid comps growth and double-digit earnings growth.