Employee benefit plans (Tables)

6 Months Ended

Jun. 30, 2025

Retirement Benefits [Abstract]

Schedule of Components of Net Periodic Benefit Cost

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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2025		2024		2025		2024
	(In thousands)
Components of net periodic benefit cost:
Interest cost	$	3,303	$	3,200	$	6,606	$	6,400
Expected return on assets	(3,645)		(4,028)		(7,290)		(8,056)
Amortization of net actuarial loss	1,194		1,037		2,387		2,074
Net periodic benefit cost	$	852	$	209	$	1,703	$	418

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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2025		2024		2025		2024
	(In thousands)
Components of net periodic benefit credit:
Service cost	$	99	$	126	$	198	$	252
Interest cost	462		459		924		918
Expected return on assets	(1,292)		(1,329)		(2,584)		(2,658)
Amortization of prior service credit	(289)		(330)		(579)		(660)
Amortization of net actuarial gain	(80)		(72)		(160)		(144)
Net periodic benefit credit, including amount capitalized	(1,100)		(1,146)		(2,201)		(2,292)
Less amount capitalized	18		47		36		69
Net periodic benefit credit	$	(1,118)	$	(1,193)	$	(2,237)	$	(2,361)