Employee benefit plans (Tables)

3 Months Ended

Mar. 31, 2024

Retirement Benefits [Abstract]

Schedule of net benefit costs

Components of net periodic benefit cost (credit) for the Company's pension benefit plans were as follows:

	Three Months Ended
	March 31,
	2024		2023
	(In thousands)
Components of net periodic benefit cost (credit):
Interest cost	$	3,200	$	3,380
Expected return on assets	(4,028)		(4,298)
Amortization of net actuarial loss	1,037		773
Net periodic benefit cost (credit)	$	209	$	(145)

Components of net periodic benefit credit for the Company's other postretirement benefit plans were as follows:

	Three Months Ended
	March 31,
	2024		2023
	(In thousands)
Components of net periodic benefit credit:
Service cost	$	126	$	138
Interest cost	459		489
Expected return on assets	(1,329)		(1,348)
Amortization of prior service credit	(330)		(330)
Amortization of net actuarial gain	(72)		(168)
Net periodic benefit credit, including amount capitalized	(1,146)		(1,219)
Less amount capitalized	22		24
Net periodic benefit credit	$	(1,168)	$	(1,243)