Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2021

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

Pension and other postretirement benefits expenses consisted of the following:

	Three Months Ended September 30,				Nine Months Ended September 30,
Pensions	2021		2020		2021		2020
Service cost	$	1,633	$	1,620	$	4,912	$	4,704
Interest cost	3,186		3,815		9,562		11,438
Expected return on plan assets	(6,963)		(7,594)		(20,897)		(22,391)
Amortization of prior service cost	83		128		248		281
Amortization of actuarial losses	3,999		3,502		12,005		10,148
Curtailment loss	—		—		—		484
Net periodic benefit cost	$	1,938	$	1,471	$	5,830	$	4,664

	Three Months Ended September 30,				Nine Months Ended September 30,
Other Postretirement Benefits	2021		2020		2021		2020
Service cost	$	27	$	20	$	77	$	61
Interest cost	203		259		615		780
Amortization of prior service cost	7		6		22		20
Amortization of actuarial losses	54		9		194		27
Net periodic benefit cost	$	291	$	294	$	908	$	888