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UNCONSOLIDATED AFFILIATES (Tables)
9 Months Ended
Sep. 30, 2020
Equity In Net Earnings From Investments  
Schedule of Equity Method Investments [Line Items]  
Schedule of Equity Method Investments [Table Text Block] The following table sets forth our equity in net earnings (loss) from investments for the periods indicated:
Three Months EndedNine Months Ended
September 30,September 30,
 2020201920202019
 
(Thousands of dollars)
Northern Border Pipeline$22,037 $16,102 $57,028 $50,593 
Overland Pass Pipeline8,007 15,481 30,090 48,340 
Roadrunner8,033 7,421 21,275 19,836 
Other(31)(1,428)(392)(3,594)
Equity in net earnings from investments$38,046 $37,576 $108,001 $115,175 
Impairment of equity investments$ $— $(37,730)$—