By James Hibberd
Updated May 06, 2011 at 04:30 PM EDT
Credit: Chris Haston/NBC

Now that Michael Scott has left Dunder Mifflin and Deangelo Vickers is ruling the roost, NBC’s The Office ratings took a tumble Thursday night.

Will Ferrell continued his guest-star stint on The Office (6.8 million viewers, 3.5 preliminary adults 18-49 rating), with the adult demo falling 17 percent after spiking last week for Steve Carell’s final episode.

Despite the declining lead-in, NBC’s Parks and Recreation (5.1 million, 2.6) was up 13 percent and the season finale of 30 Rock (4.2 million, 2.1) rose 11 percent.

Fox won the night with American Idol (20.8 million, 6.1) hiking 7 percent and Bones (11.1 million, 3.3) jumping a robust 18 percent, trouncing a series low CSI (10.5 million, 2.2).

CBS also had Big Bang Theory (10.3 million, 3.1) and Rules of Engagement (7.7 million, 2.2), both down slightly, followed by a steady The Mentalist (13.6 million, 2.6).

NBC’s comedy block also included the paintball episode of Community (3.5 million, 1.4) with guest star Josh Holloway and Anthony Michael Hall flat with last week. Plus, Outsourced (3.1 million, 1.5) was down 12 percent.

ABC aired Wipeout (4.8 million, 1.4), down a steep 26 percent to a series low, and a roughly on par Grey’s Anatomy (9.9 million, 3.5) and Private Practice (6.9 million, 2.3)

The CW’s Vampire Diaries (2.7 million, 1.2) was steady while Nikita (1.9 million, 0.8) improved.

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Episode Recaps

The Office

The mockumentary-style sitcom chronicles a group of typical office employees working 9-5 at the Scranton branch of the Dunder Mifflin Paper Company.

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