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UNCONSOLIDATED AFFILIATES (Tables)
 12 Months Ended
Dec. 31, 2021
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,
2021		December 31,
2020
  
(Thousands of dollars)
Northern Border Pipeline50%$283,170 $291,987 
Overland Pass Pipeline50%403,011 409,573 
Roadrunner50%70,777 66,794 
Other (a)Various40,655 36,678 
Investments in unconsolidated affiliates (b)$797,613 $805,032 
(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 an additional equity interest for $20.0 million.
(b) - Equity-method goodwill (Note A) was $16.5 million at December 31, 2021 and 2020.
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,
 202120202019
 
(Thousands of dollars)
Northern Border Pipeline$64,470 $75,409 $68,871 
Overland Pass Pipeline19,434 38,618 63,698 
Roadrunner33,293 29,017 26,839 
Other5,323 197 (4,867)
Equity in net earnings from investments$122,520 $143,241 $154,541 
Impairment of equity investments$— $(37,730)$—