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Basis of Presentation	12 Months Ended
Basis of Presentation	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Core Molding Technologies and its subsidiaries operate in the plastics market in a family of products known as “reinforced plastics.” Reinforced plastics are combinations of resins and reinforcing fibers (typically glass or carbon) that are molded to shape. Core Molding Technologies is a manufacturer of sheet molding compound ("SMC") and molder of fiberglass reinforced plastics. The Company specializes in large-format moldings and offers a wide range of fiberglass processes, including compression molding of SMC, glass mat thermoplastics ("GMT"), bulk molding compounds ("BMC") and direct long-fiber thermoplastics ("D-LFT"); spray-up, hand-lay-up, and resin transfer molding ("RTM"). Additionally, the Company offers reaction injection molding ("RIM"), utilizing dicyclopentadiene technology. As of December 31, 2017, Core Molding Technologies operated five production facilities in Columbus, Ohio; Batavia, Ohio; Gaffney, South Carolina; Winona, Minnesota; and Matamoros, Mexico, which produce reinforced plastic products. Effective as of January 16, 2018, the Company began operating two manufacturing facilities that were acquired as part of the Company’s acquisition of Horizon Plastics, which manufacturing facilities are located in Cobourg, Canada and Escobedo, Mexico, which produce structural foam and structural web molding. The Company operates in one business segment as a manufacturer of SMC and molder of fiberglass reinforced plastics. The Company produces and sells SMC and molded products for varied markets, including medium and heavy-duty trucks, automobiles, marine, construction and other commercial markets.