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Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2018
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)
 
2018
 
2017
Service cost for benefits earned
 
$
9,513

 
$
7,777

Interest cost on benefits obligation
 
8,846

 
8,569

Expected return on plan assets
 
(12,815
)
 
(10,317
)
Prior service cost amortization
 
338

 
218

Net actuarial loss amortization
 
3,202

 
2,325

Pension plan cost (1)
 
$
9,084

 
$
8,572

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