http://www.hollywoodreporter.com/news/cbs-les-moonves-overnight-ratings-731944?

"Overnight is almost meaningless,” says the CBS boss pointing out that a show like “Elementary” may receive 9 million in overnight viewers but it is paid for 14 million viewers, including those using DVRs.
Read more at http://www.hitfix.com/tv-tattle#8k6WFDBpfqt0p47h.99