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Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following:
 
 
June 30,
2017
 
June 30,
2016
 
Dec. 31,
2016
 
(Dollars in thousands)
Raw materials
$
209,183

 
$
219,416

 
$
179,451

Work-in-process
142,043

 
131,029

 
121,331

Finished goods
535,204

 
534,124

 
355,072

Other
12,876

 
13,296

 
15,528

 
899,306

 
897,865

 
671,382

Adjustment to value inventory
   at cost on the LIFO method
(68,419
)
 
(91,326
)
 
(68,419
)
 
$
830,887

 
$
806,539

 
$
602,963