Pension plans and other postretirement benefits (Tables)

9 Months Ended

Sep. 30, 2022

Compensation And Retirement Disclosure [Abstract]

Net Periodic Defined Benefit Cost for Defined Benefit Plans

The Company provides defined benefit pension and other postretirement benefits (including health care and life insurance benefits) to qualified retired employees. Net periodic defined benefit cost for defined benefit plans consisted of the following:

	Pension Benefits						Other Postretirement Benefits
	Three Months Ended September 30
	2022			2021			2022			2021
	(In thousands)
Service cost	$	4,423		$	5,128		$	689		$	254
Interest cost on projected benefit obligation		22,060			15,468			581			328
Expected return on plan assets		(50,188	)		(35,862	)		—			—
Amortization of prior service cost (credit)		129			139			(693	)		(1,185	)
Amortization of net actuarial loss (gain)		4,974			22,254			(370	)		(324	)
Net periodic cost (benefit)	$	(18,602	)	$	7,127		$	207		$	(927	)
	Pension Benefits						Other Postretirement Benefits
	Nine Months Ended September 30
	2022			2021			2022			2021
	(In thousands)
Service cost	$	13,237		$	15,385		$	1,914		$	760
Interest cost on projected benefit obligation		60,407			46,404			1,607			984
Expected return on plan assets		(137,421	)		(107,586	)		—			—
Amortization of prior service cost (credit)		387			415			(2,079	)		(3,554	)
Amortization of net actuarial loss (gain)		14,921			66,763			(1,111	)		(971	)
Net periodic cost (benefit)	$	(48,469	)	$	21,381		$	331		$	(2,781	)