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Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Inventories  
Schedule of Inventories Inventory consisted of the following (in thousands):

September 30,

December 31,

2020

2019

Raw materials

$

628,911

$

686,831

Supplies

497,274

498,298

Work in progress

149,929

154,669

Finished goods

333,102

349,245

Total inventories

$

1,609,216

$

1,689,043