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Basis of Presentation	12 Months Ended
Basis of Presentation	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Core Molding Technologies and its subsidiaries operate in the composites market in a family of products known as “structural composites.” Structural composites are combinations of resins and sometimes 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 thermoset and thermoplastic products. 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 structural foam and structural injection molding ("SIM") and reaction injection molding ("RIM"), utilizing dicyclopentadiene technology. As of December 31, 2018, Core Molding Technologies operated seven production facilities located in Columbus, Ohio; Batavia, Ohio; Gaffney, South Carolina; Winona, Minnesota; Matamoros and Escobedo, Mexico; and Cobourg, Canada. All produce structural composite products. The Company operates in one business segment as a manufacturer of SMC and molder of thermoplastic and thermoset structural composite products. 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.