TV Ratings: 'Parks' and 'Person' Rise, 'American Idol' and 'Grey's' Hits Low

Plenty of shows take hits on Thursday night, including a still dominant "Big Bang Theory" -- which dropped half a point in the demo from its last original.

Though approximately 3 percent of the country saw preemptions and delays on CBS thanks to NCAA basketball conference tournaments, the network still easily topped the night in adults 18-49 (3.1 rating) and total viewers (13.4 million).

The Big Bang Theory (4.5 adults) was off a full point to tie a season low, while Two and a Half Men (3.3 adults) dropped sixth tenths of a point from the last original. Person of Interest (2.9 adults) managed to grow by a tenth of a point, while Elementary (2.4 adults) was even with its last showing.

American Idol was at a low for a regularly scheduled episode of Fox. Though it will likely see an uptick in final returns, the one-hour results show (3.0 adults) was six tenths of a points shy of the last Thursday outing. Glee (2.0) was also down, dropping four tenths of a point from last week. The network averaged a 2.5 rating with adults 18-49 and 8.5 million viewers.

On ABC, Grey's Anatomy (2.6 adults) suffered for being the only new program for the night. It was down half of a point from its most recent original for a series low. The network averaged a 1.7 adults rating and 5.6 million viewers.

Community (1.5 adults) dropped half of a point on NBC, tying a low. Parks and Recreation (1.5 adults) saw the night's only upticks, rising two tenths of a point, before The Office (1.9 adults) lost a tenth of a point at 9 p.m. 1600 Penn (1.0 adults) grew by a tenth. NBC averaged a 1.2 rating with 18-49-ers and 3.2 million viewers.

On the CW, The Vampire Diaries (1.1 adults) was off two tenths of a point from its last new outing, while Beauty and the Beast was steady with a 0.5 in the demo. The CW averaged a 0.8 adults rating and 2 million viewers.

Univision averaged a 1.5 rating with adults 18-49 and 3.5 million viewers.