Employee benefit plans (Tables)

9 Months Ended

Sep. 30, 2022

Retirement Benefits [Abstract]

Schedule of net benefit costs

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

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands)
Components of net periodic benefit credit:
Interest cost	$	2,630	$	2,455	$	7,892	$	7,365
Expected return on assets	(4,864)		(4,894)		(14,592)		(14,682)
Amortization of net actuarial loss	1,670		2,004		5,012		6,012
Net periodic benefit credit	$	(564)	$	(435)	$	(1,688)	$	(1,305)

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

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(In thousands)
Components of net periodic benefit credit:
Service cost	$	354	$	400	$	1,062	$	1,200
Interest cost	474		466		1,422		1,398
Expected return on assets	(1,322)		(1,275)		(3,966)		(3,825)
Amortization of prior service credit	(350)		(349)		(1,050)		(1,047)
Amortization of net actuarial (gain) loss	(55)		6		(163)		18
Net periodic benefit credit, including amount capitalized	(899)		(752)		(2,695)		(2,256)
Less amount capitalized	48		46		132		129
Net periodic benefit credit	$	(947)	$	(798)	$	(2,827)	$	(2,385)