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PREPAID EXPENSES AND OTHER ASSETS
3 Months Ended
Mar. 31, 2021
Prepaid Expense and Other Assets, Current [Abstract]  
PREPAID EXPENSES AND OTHER ASSETS PREPAID EXPENSES AND OTHER ASSETS
Prepaid expenses and other assets consisted of the following:
 March 31, 2021December 31, 2020
 (thousands of dollars)
Prepaid license$202 $403 
Prepaid insurance premiums2,767 4,241 
Spare parts1,944 2,376 
Cash held in escrow by AMAK823 1,877 
Other prepaid expenses and assets656 301 
Total prepaid expenses and other assets$6,392 $9,198