Nu Skin Enterprises, Inc. posted fourth-quarter results with revenue that fell 4% to $609.6 million. The company reported full-year 2014 revenue decreased 19% to $2.57 billion.   “Our business performed as we expected for the quarter, and we look forward to a solid 2015,” said Truman Hunt, president and chief executive officer. “As we review the year, three factors impacted our results. First, our year-over-year comparisons were especially challenging considering that we were l...