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Inventories
 12 Months Ended
Dec. 31, 2017
Inventories [Abstract]  
Inventories
(4) Inventories

The following table presents the details of inventories as of December 31, 2017 and 2016 (in thousands):

  
December 31,
2017
  
December 31,
2016
 
Finished goods
 
$
242,333
  
$
178,740
 
Work in process
  
73,396
   
6,662
 
  
$
315,729
  
$
185,402