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UNCONSOLIDATED AFFILIATES (Tables)
 12 Months Ended
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]  
Schedule of Equity Method Investments The following table sets forth our investments in unconsolidated affiliates for the periods indicated:
Net
Ownership
Interest		December 31,
2020		December 31,
2019
  
(Thousands of dollars)
Northern Border Pipeline50%$291,987 $307,209 
Overland Pass Pipeline50%409,573 417,473 
Roadrunner50%66,794 80,816 
Other (a)Various36,678 56,346 
Investments in unconsolidated affiliates (b)$805,032 $861,844 
(a) - Year ended December 31, 2020, includes the impact of noncash impairment charges of $37.7 million related to the equity investments discussed below, offset partially by an acquisition of additional equity interest for $20.0 million.
(b) - Equity-method goodwill (Note A) was $16.5 million and $38.8 million at December 31, 2020 and 2019, respectively.
Equity In Net Earnings From Investments  
Schedule of Equity Method Investments [Line Items]  
Schedule of Equity Method Investments The following table sets forth our equity in net earnings (loss) from investments for the periods indicated:
 Years Ended December 31,
 202020192018
 
(Thousands of dollars)
Northern Border Pipeline$75,409 $68,871 $67,854 
Overland Pass Pipeline38,618 63,698 65,887 
Roadrunner29,017 26,839 22,993 
Other197 (4,867)1,649 
Equity in net earnings from investments$143,241 $154,541 $158,383 
Impairment of equity investments$(37,730)$— $—