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Post Retirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2019
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 nine months ended September 30, 2019 and 2018 are as follows:
 
Three months ended
 
Nine months ended
 
September 30,
 
September 30,
 
2019
 
2018
 
2019
 
2018
Pension expense:
 
 
 
 
 
 
 
Multi-employer plan
$
270,000

 
$
186,000

 
$
732,000

 
$
549,000

Defined contribution plan
364,000

 
182,000

 
950,000

 
698,000

Total pension expense
634,000

 
368,000

 
1,682,000

 
1,247,000

 
 
 
 
 
 
 
 
Health and life insurance:
 
 
 
 
 
 
 
Interest cost
72,000

 
69,000

 
216,000

 
207,000

Amortization of prior service costs
(125,000
)
 
(124,000
)
 
(375,000
)
 
(372,000
)
Amortization of net loss
30,000

 
43,000

 
88,000

 
129,000

Net periodic benefit cost
(23,000
)
 
(12,000
)
 
(71,000
)
 
(36,000
)
 
 
 
 
 
 
 
 
Total post retirement benefits expense
$
611,000

 
$
356,000

 
$
1,611,000

 
$
1,211,000