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Pension Plans and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 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 six-month periods ended June 30, 2018 and 2017 were as follows (in thousands):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2018
 
2017
 
2018
 
2017
Pension Benefits Cost (Credit):
 
 
 
 
 
 
 
Service cost
$
1,259

 
$
1,020

 
$
2,527

 
$
2,023

Interest cost
8,016

 
8,320

 
16,043

 
16,608

Expected return on assets
(10,760
)
 
(9,931
)
 
(21,524
)
 
(19,839
)
Amortization of prior service benefit
24

 
46

 
46

 
73

Total net pension benefits credit
$
(1,461
)
 
$
(545
)
 
$
(2,908
)
 
$
(1,135
)
Postretirement Benefits Cost (Credit):
 
 
 
 
 
 
 
Service cost
$
30

 
$
30

 
$
59

 
$
61

Interest cost
542

 
585

 
1,084

 
1,170

Expected return on assets
(2
)
 
(27
)
 
(4
)
 
(55
)
Amortization of prior service benefit
(12
)
 
(24
)
 
(24
)
 
(48
)
Total net postretirement benefits cost
$
558

 
$
564

 
$
1,115

 
$
1,128

Total net pension and postretirement benefits (credit) cost
$
(903
)
 
$
19

 
$
(1,793
)
 
$
(7
)