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Employee Retirement Plans
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefits Disclosure [Text Block]
9.
Employee Retirement Plans
 
The components of the Company’s net periodic pension cost were as follows:
 
 
 
Three Months Ended June 30,
 
 
Six Months Ended June 30,
 
 
 
2018
 
 
2017
 
 
2018
 
 
2017
 
 
 
(Dollars in thousands)
 
Service cost
 
$
151
 
 
$
142
 
 
$
301
 
 
$
282
 
Interest cost
 
 
549
 
 
 
555
 
 
 
1,098
 
 
 
1,103
 
Expected return on plan assets
 
 
(646
)
 
 
(609
)
 
 
(1,292
)
 
 
(1,151
)
Net amortization and deferral
 
 
159
 
 
 
143
 
 
 
319
 
 
 
263
 
 Net periodic pension cost
 
$
213
 
 
$
231
 
 
$
426
 
 
$
497
 
 
The components of net periodic pension cost other than the service cost component are included in "other expense, net" in the Consolidated Condensed Statements of Earnings and Comprehensive Income (Unaudited).
 
The Company made a $3.0 million pension contribution in the second quarter of 2018. No additional cash contributions are expected for the remainder of 2018.