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UNCONSOLIDATED AFFILIATES (Tables)
9 Months Ended
Sep. 30, 2022
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 from investments for the periods indicated:
Three Months EndedNine Months Ended
September 30,September 30,
 2022202120222021
 (Thousands of dollars)
Northern Border Pipeline$16,744 $14,634 $53,216 $47,459 
Roadrunner9,600 8,056 28,041 23,407 
Overland Pass Pipeline10,486 5,241 23,379 12,952 
Other2,350 642 6,514 3,795 
Equity in net earnings from investments$39,180 $28,573 $111,150 $87,613