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Pension Plans and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Domestic and Foreign Pension and Postretirement Defined Benefit Plans
The components of pension and postretirement benefits cost (credit) for the three-month and nine-month periods ended September 30, 2019 and 2018 were as follows (in thousands):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2019
 
2018
 
2019
 
2018
Pension Benefits Cost (Credit):
 
 
 
 
 
 
 
Service cost
$
1,118

 
$
1,238

 
$
3,371

 
$
3,765

Interest cost
8,314

 
7,967

 
24,854

 
24,010

Expected return on assets
(9,414
)
 
(10,703
)
 
(28,311
)
 
(32,227
)
Amortization of prior service benefit
(5
)
 
25

 
7

 
71

Total net pension benefits cost (credit)
$
13

 
$
(1,473
)
 
$
(79
)
 
$
(4,381
)
Postretirement Benefits Cost (Credit):
 
 
 
 
 
 
 
Service cost
$
24

 
$
29

 
$
73

 
$
88

Interest cost
549

 
542

 
1,647

 
1,626

Expected return on assets
—

 
(1
)
 
—

 
(5
)
Amortization of prior service benefit
—

 
(12
)
 
—

 
(36
)
Total net postretirement benefits cost
$
573

 
$
558

 
$
1,720

 
$
1,673

Total net pension and postretirement benefits cost (credit)
$
586

 
$
(915
)
 
$
1,641

 
$
(2,708
)