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Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2019
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)
 
2019
 
2018
Service cost for benefits earned
 
$
8,463

 
$
9,513

Interest cost on benefits obligation
 
9,827

 
8,846

Expected return on plan assets
 
(11,871
)
 
(12,815
)
Prior service cost amortization
 
349

 
338

Net actuarial loss amortization
 
1,278

 
3,202

Pension plan cost (1)
 
$
8,046

 
$
9,084

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