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Inventories
 9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories

Inventories consisted of the following:
 
 
Sept. 30,
2017
 
Sept. 30,
2016
 
Dec. 31,
2016
 
(Dollars in thousands)
Raw materials
$
211,959

 
$
213,020

 
$
179,451

Work-in-process
132,071

 
113,393

 
121,331

Finished goods
415,645

 
389,073

 
355,072

Other
13,128

 
13,931

 
15,528

 
772,803

 
729,417

 
671,382

Adjustment to value inventory
   at cost on the LIFO method
(68,419
)
 
(91,326
)
 
(68,419
)
 
$
704,384

 
$
638,091

 
$
602,963