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Post Retirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The components of expense for the Company's post-retirement benefit plans for the three months ended March 31, 2020 and 2019 are as follows:
 
Three Months Ended
 
March 31,
 
2020
 
2019
Pension expense:
 
 
 
Multi-employer plan
$
246,000

 
$
231,000

Defined contribution plan
293,000

 
261,000

Total pension expense
539,000

 
492,000

 
 
 
 
Health and life insurance:
 
 
 
Interest cost
59,000

 
71,000

Amortization of prior service costs
(124,000
)
 
(124,000
)
Amortization of net loss
45,000

 
29,000

Net periodic benefit cost
(20,000
)
 
(24,000
)
 
 
 
 
Total post retirement benefits expense
$
519,000

 
$
468,000