Fast National ratings for Thursday, May 10, 2012.
"American Idol" was flat week-to-week and lifted FOX to a win on Thursday night among young viewers, while the season finale of "The Big Bang Theory," despite a week-to-week drop, led CBS' overall win.
Among other ratings highlights, finales for "The Vampire Diaries," "The Office" and "Parks and Recreation" were steady, a pre-finale "Grey's Anatomy" delivered its biggest demos in months and NBC's "Awake" stopped its steady decline (at least for a week).
Among adults 18-49, FOX averaged a 2.9 rating for the night, edging out CBS' 2.8 rating in the key demographic. ABC was third with a 2.2 rating, with NBC averaging a 1.4 key demo rating. The CW averaged a 0.8 key demo rating for Thursday night.
Overall, though, CBS averaged an estimated 12.06 million viewers and a 7.5 rating/12 share, beating FOX's 6.7/11 and 11.02 million viewers for Thursday primetime. ABC was a distant third with a 5.1/8 and 7.47 million viewers, still far ahead of NBC's 2.0/3 and 3.16 million viewers. The CW averaged a 1.2/2 and 1.86 million viewers.
[For Thursday night, Univision averaged 3.58 million viewers and a 1.4 rating among adults 18-49.]

8 p.m. - FOX started Thursday primetime in first with nearly 15.1 million viewers and a 3.9 rating among adults 18-49. CBS' "The Big Bang Theory" (13.3 million and a 4.2 key demo) beat "Idol" for its half-hour, but "Rules of Engagement" (8.95 million and a 2.7 key demo) did not. ABC's "Missing" averaged 6.36 million viewers for third overall and came in tied for fourth in the key demo with a 1.1 rating. NBC was fourth overall and third in the demo with "Community" (3.12 million and a 1.4 key demo rating) and "30 Rock" (2.95 million and a 1.5 key demo). The CW's season finale of "The Vampire Diaries" averaged 2.49 million viewers and a 1.1 key demo rating.
9 p.m. - CBS moved into first overall in the 9 p.m. hour with the 12.685 million viewers for "Person of Interest," which finished second with a 2.6 rating among adults 18-49. ABC's "Grey's Anatomy" was second with 9.56 million viewers and won the hour with a 3.4 key demo rating. FOX's "Touch" averaged 6.94 million viewers and a 2.0 key demo rating. NBC was fourth overall and tied for third in the key demo with finales of "The Office" (4.44 million viewers and a 2.2 key demo) and "Parks and Recreation" (3.46 million and a 1.7 key demo). The CW's "Secret Circle" finale averaged 1.24 million viewers and a 0.5 key demo rating, as it now goes to wait on the netlet's bubble.
10 p.m. - "The Mentalist" averaged 12.42 million viewers and a 2.4 rating among adults 18-49 to win the 10 p.m. hour for CBS. ABC's "Scandal" averaged 6.48 million viewers and a 2.0 key demo rating, slightly down from last week. NBC's "Awake" was slightly up with nearly 2.5 million viewers and a 0.9 key demo rating. 
All ratings information comes from preliminary Fast National Nielsen data, which includes live and same-day DVR viewing. All numbers are subject to change.
A long-time member of the TCA Board and a longer-time blogger of "American Idol," Dan Fienberg writes about TV, except for when he writes about movies or sometimes writes about the Red Sox. But never music. He would sound stupid talking about music.