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INVENTORIES (Tables)
 12 Months Ended
Dec. 31, 2019
INVENTORIES [Abstract]  
Inventories

in thousands

2019

2018

Inventories

Finished products 1

$      391,666 

$     372,604 

Raw materials

31,318 

27,942 

Products in process

5,604 

3,064 

Operating supplies and other

29,720 

25,720 

Total

$      458,308 

$     429,330 

1

Includes inventories encumbered by volumetric production payments (see Note 2), as follows: December 31, 2019 — $2,861 thousand and December 31, 2018 — $3,230 thousand.