Employee benefit plans (Tables)

6 Months Ended

Jun. 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				Six Months Ended
	June 30,				June 30,
	2022		2021		2022		2021
	(In thousands)
Components of net periodic benefit credit:
Interest cost	$	2,631	$	2,455	$	5,262	$	4,910
Expected return on assets	(4,864)		(4,894)		(9,728)		(9,788)
Amortization of net actuarial loss	1,671		2,004		3,342		4,008
Net periodic benefit credit	$	(562)	$	(435)	$	(1,124)	$	(870)

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,
	2022		2021		2022		2021
	(In thousands)
Components of net periodic benefit credit:
Service cost	$	354	$	400	$	708	$	800
Interest cost	474		466		948		932
Expected return on assets	(1,322)		(1,275)		(2,644)		(2,550)
Amortization of prior service credit	(350)		(349)		(700)		(698)
Amortization of net actuarial (gain) loss	(54)		6		(108)		12
Net periodic benefit credit, including amount capitalized	(898)		(752)		(1,796)		(1,504)
Less amount capitalized	53		44		84		83
Net periodic benefit credit	$	(951)	$	(796)	$	(1,880)	$	(1,587)