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Pension, Savings, And Other Employee Benefits (Tables)
9 Months Ended
Sep. 30, 2020
Retirement Benefits, Description [Abstract]  
Schedule of Components of Net Periodic Benefit Cost
The components of net periodic benefit cost for the three months ended September 30 were as follows:
 Pension BenefitsOther Benefits
(Dollars in thousands)2020201920202019
Components of net periodic benefit cost
Service cost$8 $$25 $23 
Interest cost5,844 7,505 304 358 
Expected return on plan assets(7,000)(9,335)(325)(314)
Amortization of unrecognized:
Prior service cost (credit) — 8 — 
Actuarial (gain) loss3,381 2,546 (64)(112)
Net periodic benefit cost (credit)$2,233 $723 $(52)$(45)



The components of net periodic benefit cost for the nine months ended September 30 were as follows:
 Pension BenefitsOther Benefits
(Dollars in thousands)2020201920202019
Components of net periodic benefit cost
Service cost$24 $23 $74 $71 
Interest cost17,663 22,655 915 1,060 
Expected return on plan assets(19,337)(27,681)(947)(852)
Amortization of unrecognized:
Prior service cost (credit) — 24 — 
Actuarial (gain) loss9,829 7,416 (218)(346)
Net periodic benefit cost (credit)$8,179 $2,413 $(152)$(67)