0000104889 2020-12-10 2020-12-10 false 0000104889 8-K 2020-12-10 GRAHAM HOLDINGS CO DE 001-06714 53-0182885 1300 North 17th Street Arlington VA 22209 703 345-6300 false false false false Class B Common Stock, par value $1.00 per share GHC NYSE false