GREENWOOD VILLAGE, Colo.--(BUSINESS WIRE)--Red Robin Gourmet Burgers, Inc., (NASDAQ:RRGB), a casual dining restaurant chain serving an innovative selection of high-quality gourmet burgers in a family-friendly atmosphere, today reported financial results for the 16 weeks ended April 19, 2015. First Quarter Financial Highlights First quarter revenues were $394.9 million, an increase of 16.0% over the same period a year ago Comparable restaurant revenue increased 3.1% over the same period a year a