Pension and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2019

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	2019			2018			2019			2018
Service cost	$	1,275		$	1,398		$	2,708		$	2,988
Interest cost	4,572			4,383			9,108			8,692
Expected return on plan assets	(7,349		)	(7,383		)	(14,427		)	(14,777		)
Amortization of prior service cost	98			140			201			281
Amortization of actuarial losses	2,285			3,029			4,443			5,840
Settlement loss	247			—			247			—
Net periodic benefit cost	$	1,128		$	1,567		$	2,280		$	3,024

	Three months ended June 30,					Six months ended June 30,
Other Postretirement Benefits	2019			2018		2019		2018
Service cost	$	16		$	18	$	35	$	42
Interest cost	333			337		673		681
Amortization of prior service cost	7			5		13		10
Amortization of actuarial (gains) losses	(3		)	126		7		286
Net periodic benefit cost	$	353		$	486	$	728	$	1,019