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Pension and Other Postretirement Benefits
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Pension and Other Postretirement Benefits
Pension and Other Postretirement Benefits

Pension and other postretirement benefits expenses consisted of the following:
 
Three months ended March 31,
Pensions
2017
 
2016
Service cost
$
1,643

 
$
1,384

Interest cost
4,621

 
4,836

Expected return on plan assets
(6,860
)
 
(7,543
)
Amortization of prior service cost
109

 
50

Amortization of actuarial losses
2,480

 
2,556

Settlement gain
(261
)
 
—

Net periodic benefit cost
$
1,732

 
$
1,283

 
 
 
 

 
Three months ended March 31,
Other Postretirement Benefits
2017
 
2016
Service cost
$
22

 
$
34

Interest cost
389

 
453

Amortization of prior service credit
(17
)
 
(93
)
Amortization of actuarial losses
69

 
176

Net periodic benefit cost
$
463

 
$
570


The Company now expects to contribute approximately $20,000 to its various defined benefit pension plans in 2017, including approximately $15,000 of discretionary contributions to its U.S Qualified pension plans.