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Stock Based Compensation (Narrative) (Details) - Long Term Equity Incentive Plan - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Terms of Award | The Company has a Long-Term Equity Incentive Plan (the “2006 Plan”), as approved by the Company’s stockholders in May 2006. The 2006 Plan allows for grants to directors and employees of non-qualified stock options, incentive stock options, stock appreciation rights, restricted stock, performance shares, performance units and other incentive awards (“Stock Awards”) up to an aggregate of 3,000,000 awards, each representing a right to buy a share of Core Molding Technologies common stock. Stock Awards can be granted under the 2006 Plan through the earlier of December 31, 2025, or the date the maximum number of available awards under the 2006 Plan have been granted. |  |
Number of shares authorized for grant | 3,000,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 514,823 |  |
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Terms of Award | Restricted stock granted under the 2006 Plan vest over three years or upon the date of the participants' sixty-fifth birthday, death, disability or change in control. |  |
Award Vesting Period | 3 years |  |
Unrecognized compensation expense | $ 1,614,000 | $ 1,923,000 |
Compensation costs | $ 1,254,000 | 1,369,000 | $ 1,774,000
Weighted Average Remaining Contractual Term | 1 year 10 months 24 days |  |
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | $ 97,000 | $ 98,000 | $ 110,000
Shares Withheld for Tax Withholding Obligation | 4,574 | 16,047 | 17,180
Stock Appreciation Rights (SARs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Terms of Award | As part of the Company's 2019 annual grant, Stock Appreciation Rights (SARs) were granted with a grant price of $10. These awards have a contractual term of five years and vest ratably over a period of three years or immediately vest if the recipient is over 65 years of age. These awards are valued using the Black-Scholes option pricing model. |  |
Award Vesting Period | 3 years |  |
Unrecognized compensation expense | $ 179,000 | $ 386,000 |
Compensation costs | $ 101,000 | $ 185,000 |
Weighted Average Remaining Contractual Term | 3 years 3 months 18 days |  |
Grant price |  | $ 10 |
Expected Term | 5 years |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition | 1 year 3 months 18 days |  |
Intrinsic Value | $ 114,000 |  |

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