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Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Schedule of cost of pension plans
The cost of our pension plans are as follows:
 
 
Three months ended September 30,
 
Nine months ended September 30,
(in thousands)
 
2018
 
2017
 
2018
 
2017
Service cost for benefits earned
 
$
9,513

 
$
7,777

 
$
28,539

 
$
23,330

Interest cost on benefits obligation
 
8,845

 
8,569

 
26,536

 
25,706

Expected return on plan assets
 
(12,815
)
 
(10,317
)
 
(38,444
)
 
(30,950
)
Prior service cost amortization
 
339

 
218

 
1,015

 
654

Net actuarial loss amortization
 
3,202

 
2,325

 
9,606

 
6,975

Pension plan cost (1)
 
$
9,084

 
$
8,572

 
$
27,252

 
$
25,715

 
(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.