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Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2019
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)
 
2019
 
2018
 
2019
 
2018
Service cost for benefits earned
 
$
8,464

 
$
9,513

 
$
16,927

 
$
19,026

Interest cost on benefits obligation
 
9,826

 
8,845

 
19,653

 
17,691

Expected return on plan assets
 
(11,871
)
 
(12,814
)
 
(23,742
)
 
(25,629
)
Prior service cost amortization
 
348

 
338

 
697

 
676

Net actuarial loss amortization
 
1,278

 
3,202

 
2,556

 
6,404

Pension plan cost (1)
 
$
8,045

 
$
9,084

 
$
16,091

 
$
18,168

 
(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.