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TRADE RECEIVABLES
 9 Months Ended
Sep. 30, 2020
Receivables [Abstract]  
TRADE RECEIVABLES TRADE RECEIVABLES
Trade receivables, net, consisted of the following:
 September 30, 2020December 31, 2019
 (thousands of dollars)
Trade receivables$23,084 $26,749 
Less allowance for doubtful accounts(428)(429)
Trade receivables, net$22,656 $26,320 

Trade receivables serve as collateral for our amended and restated credit agreement. See Note 11.