Pension and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2020

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

Pension and other postretirement benefits expenses consisted of the following:

	Three Months Ended June 30,						Six Months Ended June 30,
Pensions	2020			2019			2020			2019
Service cost	$	1,435		$	1,275		$	3,084		$	2,708
Interest cost	3,806			4,572			7,623			9,108
Expected return on plan assets	(7,404		)	(7,349		)	(14,797		)	(14,427		)
Amortization of prior service cost	73			98			153			201
Amortization of actuarial losses	3,307			2,285			6,646			4,443
Curtailment loss	484			—			484			—
Settlement loss	—			247			—			247
Net periodic benefit cost	$	1,701		$	1,128		$	3,193		$	2,280

	Three Months Ended June 30,						Six Months Ended June 30,
Other Postretirement Benefits	2020			2019			2020		2019
Service cost	$	19		$	16		$	41	$	35
Interest cost	257			333			521		673
Amortization of prior service cost	7			7			14		13
Amortization of actuarial losses	(5		)	(3		)	18		7
Net periodic benefit cost	$	278		$	353		$	594	$	728