Amgen Inc. (NASDAQ:AMGN) reported first-quarter financial results after the closing bell Thursday. Here's a look at the highlights. The Details: Amgen reported quarterly earnings of $3.96 per share, which beat the analyst consensus estimate of $3.87 by 2.33%. The company said EPS decreased by 1% due to higher operating and interest expenses driven by the Horizon acquisition, partially offset by higher revenues. The company reported quarterly sales of $7.447 billion, which beat the analyst consensus estimate of $7.436 billion ...