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Inventories:
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventories [Text Block] Inventories
 
Inventories consisted of the following (in thousands): 
 
June 30, 2019
 
December 31, 2018
Raw material
$
101,402

 
$
104,104

Work in process
48,883

 
52,909

Finished goods
179,670

 
154,150

Total inventories
$
329,955

 
$
311,163