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Inventories
 6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventories Inventories

Inventories consisted of the following:
 
 
June 30,
2019
 
June 30,
2018
 
Dec. 31,
2018
 
(Dollars in thousands)
Raw materials
$
271,396

 
$
252,792

 
$
288,860

Work-in-process
141,268

 
136,210

 
123,574

Finished goods
523,145

 
514,911

 
335,180

Other
12,658

 
12,629

 
13,075

 
948,467

 
916,542

 
760,689

Adjustment to value inventory
   at cost on the LIFO method
(125,883
)
 
(82,823
)
 
(125,883
)
 
$
822,584

 
$
833,719

 
$
634,806