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PREPAID EXPENSES AND OTHER ASSETS (Tables)
9 Months Ended
Sep. 30, 2020
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, 2020December 31, 2019
 (thousands of dollars)
Prepaid license$605 $1,209 
Prepaid insurance premiums1,767 — 
Spare parts2,330 1,857 
Insurance receivable— 1,148 
Cash held in escrow by AMAK1,877 — 
Other prepaid expenses and assets437 733 
Total prepaid expenses and other assets$7,016 $4,947