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PREPAID EXPENSES AND OTHER ASSETS (Tables)
9 Months Ended
Sep. 30, 2021
Prepaid Expense and Other Assets, Current [Abstract]  
Schedule of Prepaid Expenses and Other Assets
Prepaid expenses and other assets consisted of the following:
 September 30, 2021December 31, 2020
 (thousands of dollars)
Prepaid license$— $403 
Prepaid insurance premiums2,748 4,241 
Spare parts2,219 2,376 
Cash held in escrow by AMAK— 1,877 
Other prepaid expenses and assets1,676 301 
Total prepaid expenses and other assets$6,643 $9,198