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Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Schedule of Cost of Pension Plans
The cost of our pension plans are as follows:
 
 
Three months ended March 31,
(in thousands)
 
2020
 
2019
Service cost for benefits earned
 
$
10,873

 
$
8,463

Interest cost on benefits obligation
 
9,395

 
9,827

Expected return on plan assets
 
(12,353
)
 
(11,871
)
Prior service cost amortization
 
336

 
349

Net actuarial loss amortization
 
3,031

 
1,278

Pension plan cost (1)
 
$
11,282

 
$
8,046

 
(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.