Since its inception in 1920, the National Football League (NFL) has played games on Thanksgiving Day, patterned upon the historic playing of college football games on and around the Thanksgiving holiday. The NFL's Thanksgiving Day games have traditionally included one game hosted by the Detroit Lions since 1934, and one game hosted by the Dallas Cowboys since 1966 (with two exceptions in 1975 and 1977). Since 2006, a third prime time game has also been played on Thanksgiving. Unlike the afternoon games, this game has no fixed host and features different teams annually; the prime time game has been contested almost solely by division rivals since 2012.