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Pension Plans and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2018
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, 2018 and 2017 were as follows (in thousands):
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2018
 
2017
 
2018
 
2017
Pension Benefits Cost (Credit):
 
 
 
 
 
 
 
Service cost
$
1,238

 
$
1,067

 
$
3,765

 
$
3,090

Interest cost
7,967

 
8,375

 
24,010

 
24,983

Expected return on assets
(10,703
)
 
(9,960
)
 
(32,227
)
 
(29,799
)
Amortization of prior service benefit
25

 
29

 
71

 
102

Total net pension benefits credit
$
(1,473
)
 
$
(489
)
 
$
(4,381
)
 
$
(1,624
)
Postretirement Benefits Cost (Credit):
 
 
 
 
 
 
 
Service cost
$
29

 
$
30

 
$
88

 
$
91

Interest cost
542

 
585

 
1,626

 
1,755

Expected return on assets
(1
)
 
(28
)
 
(5
)
 
(83
)
Amortization of prior service benefit
(12
)
 
(24
)
 
(36
)
 
(72
)
Total net postretirement benefits cost
$
558

 
$
563

 
$
1,673

 
$
1,691

Total net pension and postretirement benefits (credit) cost
$
(915
)
 
$
74

 
$
(2,708
)
 
$
67