Thursday, December 19, 2013 ratings — New episodes: The Sing-Off and The X Factor. Specials: The Year and A Charlie Brown Christmas (rerun). Reruns: The Big Bang Theory, The Millers, The Crazy Ones, Two and a Half Men, Elementary, Saturday Night Live, The Vampire Diaries, and Reign.

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These are the fast affiliate ratings. The percentages represent the change since the previous original episode. (Percentages aren’t given for reruns or specials.) To see past ratings for a particular show, click the show’s link. The show pages are updated with the daily final ratings when they become available. Those pages include season averages to date.

What were you watching last night? Original network programming, reruns, cable, or something else?