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Post Retirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The components of expense for Core Molding Technologies’ post-retirement benefit plans for the three and six months ended June 30, 2018 and 2017 are as follows:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2018
 
2017
 
2018
 
2017
Pension expense:
 
 
 
 
 
 
 
Multi-employer plan
$
185,000

 
$
169,000

 
$
363,000

 
$
326,000

Defined contribution plan
286,000

 
188,000

 
545,000

 
395,000

Total pension expense
471,000

 
357,000

 
908,000

 
721,000

 
 
 
 
 
 
 
 
Health and life insurance:
 
 
 
 
 
 
 
Interest cost
69,000

 
74,000

 
138,000

 
149,000

Amortization of prior service costs
(124,000
)
 
(124,000
)
 
(248,000
)
 
(248,000
)
Amortization of net loss
43,000

 
38,000

 
86,000

 
75,000

Net periodic benefit cost
(12,000
)
 
(12,000
)
 
(24,000
)
 
(24,000
)
 
 
 
 
 
 
 
 
Total post retirement benefits expense
$
459,000

 
$
345,000

 
$
884,000

 
$
697,000