Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2020

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	2020		2019		2020		2019
Service cost	$	1,620	$	1,356	$	4,704	$	4,064
Interest cost	3,815		4,539		11,438		13,647
Expected return on plan assets	(7,594)		(7,389)		(22,391)		(21,816)
Amortization of prior service cost	128		101		281		302
Amortization of actuarial losses	3,502		2,215		10,148		6,658
Curtailment loss	—		—		484		—
Settlement loss	—		93		—		340
Net periodic benefit cost	$	1,471	$	915	$	4,664	$	3,195

	Three Months Ended September 30,				Nine Months Ended September 30,
Other Postretirement Benefits	2020		2019		2020		2019
Service cost	$	20	$	18	$	61	$	53
Interest cost	259		335		780		1,008
Amortization of prior service cost	6		6		20		19
Amortization of actuarial losses	9		3		27		10
Net periodic benefit cost	$	294	$	362	$	888	$	1,090