Pension and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2019

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

Pension and other postretirement benefits expenses consisted of the following:

	Three months ended March 31,
Pensions	2019			2018
Service cost	$	1,433		$	1,590
Interest cost	4,536			4,309
Expected return on plan assets	(7,078		)	(7,394		)
Amortization of prior service cost	103			141
Amortization of actuarial losses	2,158			2,811
Net periodic benefit cost	$	1,152		$	1,457

	Three months ended March 31,
Other Postretirement Benefits	2019		2018
Service cost	$	19	$	24
Interest cost	340		344
Amortization of prior service cost	6		5
Amortization of actuarial losses	10		160
Net periodic benefit cost	$	375	$	533