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Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2018
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)
 
2018
 
2017
 
2018
 
2017
Service cost for benefits earned
 
$
9,513

 
$
7,776

 
$
19,026

 
$
15,553

Interest cost on benefits obligation
 
8,845

 
8,568

 
17,691

 
17,137

Expected return on plan assets
 
(12,814
)
 
(10,316
)
 
(25,629
)
 
(20,633
)
Prior service cost amortization
 
338

 
218

 
676

 
436

Net actuarial loss amortization
 
3,202

 
2,325

 
6,404

 
4,650

Pension plan cost (1)
 
$
9,084

 
$
8,571

 
$
18,168

 
$
17,143

 
(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.