Shares of RenaissanceRe (RNR) have been strong performers lately, with the stock up 4.5% over the past month. The stock hit a new 52-week high of $269.61 in the previous session. RenaissanceRe has gained 37.3% since the start of the year compared to the 17.3% move for the Zacks Finance sector and the 27.1% return for the Zacks Insurance - Property and Casualty industry. What's Driving the Outperformance? The stock has an impressive record of positive earnings surprises, as it hasn't missed our earnings cons ...