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Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Inventories  
Schedule of inventories

December 31,

December 31,

    

2019

    

2018

(in thousands)

Materials

$

82,155

$

90,816

Work-in-process

 

42,575

 

42,354

Finished goods

 

8,337

 

23,141

Total

$

133,067

$

156,311