Retirement plans (Tables)

9 Months Ended

Sep. 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 Sept. 30,				Nine months ended Sept. 30,
	2022		2021		2022		2021
Service cost-benefits earned during the period	$	—	$	1	$	—	$	2
Interest cost on benefit obligation	4,270		3,969		12,811		11,907
Expected return on plan assets	(4,876)		(8,670)		(14,627)		(26,010)
Amortization of prior service (credit) cost	(119)		23		(361)		68
Amortization of actuarial loss	1,150		1,223		3,452		3,669
Pension payment timing related charge	—		946		—		946
Expense (income) from company-sponsored retirement plans	$	425	$	(2,508)	$	1,275	$	(9,418)