Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2020

Retirement Benefits [Abstract]

Schedule of Cost of Pension Plans

The cost of our pension plans are as follows:

	Three months ended June 30,				Six months ended June 30,
(in thousands)	2020		2019		2020		2019
Service cost for benefits earned	$	10,874	$	8,464	$	21,747	$	16,927
Interest cost on benefits obligation	9,394		9,826		18,789		19,653
Expected return on plan assets	(12,353)		(11,871)		(24,706)		(23,742)
Prior service cost amortization	335		348		671		697
Net actuarial loss amortization	3,031		1,278		6,062		2,556
Pension plan cost (1)	$	11,281	$	8,045	$	22,563	$	16,091

(1)The components of pension plan costs other than the service cost component are included in the line item "Other (expense) income" in the Statements of Operations after reimbursements from the Exchange and its subsidiaries.