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UNCONSOLIDATED AFFILIATES (Tables)
3 Months Ended
Mar. 31, 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 Ended
 
March 31,
 
2020
 
2019
 
(Thousands of dollars)
Northern Border Pipeline
$
22,120

 
$
20,802

Overland Pass Pipeline
14,111

 
17,394

Roadrunner
6,433

 
6,338

Other
1,963

 
(1,053
)
Equity in net earnings from investments
$
44,627

 
$
43,481

Impairment of equity investments
$
(37,730
)
 
$