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Retirement plans (Tables)
6 Months Ended
Jun. 30, 2022
Retirement Benefits [Abstract]  
Schedule of Benefit Costs (Income)
Pension costs (income), which primarily include costs for the qualified TRP and the non-qualified SERP, are presented in the following table (in thousands):
Quarter ended June 30,Six months ended June 30,
2022202120222021
Service cost-benefits earned during the period$— $$— $
Interest cost on benefit obligation4,241 3,988 8,541 7,938 
Expected return on plan assets(4,851)(8,690)(9,751)(17,340)
Amortization of prior service cost(117)20 (242)45 
Amortization of actuarial loss1,202 1,246 2,302 2,446 
Expense (income) from company-sponsored retirement plans$475 $(3,435)$850 $(6,910)