atings for The Big Bang Theory continue to explode. Returning with new episodes after weeks of reruns in December, the CBS sitcom drew 18.98 million viewers Thursday night, equaling a series high. Just about every other program on the network posted terrific numbers as well, several of them season highs, including Two and a Half Men with 15.4 million viewers and Person of Interest with 16.1 million. The 10:00 p.m. drama Elementary attracted 11.4 million viewers. In every half hour, CBS drew more viewers than all of the other networks combined.