Pension and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2021

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

Pension and other postretirement benefits expenses consisted of the following:

	Three Months Ended March 31,
Pensions	2021		2020
Service cost	$	1,741	$	1,649
Interest cost	3,172		3,817
Expected return on plan assets	(6,972)		(7,393)
Amortization of prior service cost	85		80
Amortization of actuarial losses	3,926		3,339
Net periodic benefit cost	$	1,952	$	1,492

	Three Months Ended March 31,
Other Postretirement Benefits	2021		2020
Service cost	$	25	$	22
Interest cost	206		264
Amortization of prior service cost	7		7
Amortization of actuarial losses	70		23
Net periodic benefit cost	$	308	$	316