Employee benefit plans (Tables)

3 Months Ended

Mar. 31, 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
	March 31,
	2022		2021
	(In thousands)
Components of net periodic benefit credit:
Interest cost	$	2,631	$	2,455
Expected return on assets	(4,864)		(4,894)
Amortization of net actuarial loss	1,671		2,004
Net periodic benefit credit	$	(562)	$	(435)

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

	Three Months Ended
	March 31,
	2022		2021
	(In thousands)
Components of net periodic benefit credit:
Service cost	$	354	$	400
Interest cost	474		466
Expected return on assets	(1,322)		(1,275)
Amortization of prior service credit	(350)		(349)
Amortization of net actuarial (gain) loss	(54)		6
Net periodic benefit credit, including amount capitalized	(898)		(752)
Less amount capitalized	31		39
Net periodic benefit credit	$	(929)	$	(791)