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Defined Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Schedule of Costs of Retirement Plans The components of net periodic pension cost (income) are as follows (dollars in thousands):
 Three months ended
June 30,
Six months ended
June 30,
 2023202220232022
Service costs$120 $160 $240 $360 
Interest costs310 230 630 460 
Expected return on plan assets(520)(420)(1,050)(830)
Settlement and curtailment losses1,020 — 1,020 150 
Amortization of net loss40 150 70 290 
Net periodic benefit cost$970 $120 $910 $430