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UNCONSOLIDATED AFFILIATES (Tables)
 6 Months Ended
Jun. 30, 2019
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
 
Six Months Ended
 
June 30,
 
June 30,
 
2019
 
2018
 
2019
 
2018
 
(Thousands of dollars)
Northern Border Pipeline
$
13,689

 
$
15,240

 
$
34,491

 
$
32,377

Overland Pass Pipeline
15,465

 
16,246

 
32,859

 
32,633

Roadrunner
6,077

 
5,542

 
12,415

 
10,500

Other
(1,113
)
 
(458
)
 
(2,166
)
 
1,247

Equity in net earnings from investments
$
34,118

 
$
36,570

 
$
77,599

 
$
76,757
Unconsolidated Affiliates Financial Information  
Schedule of Equity Method Investments [Line Items]  
Schedule of Equity Method Investments [Table Text Block] The following table sets forth summarized combined financial information of our unconsolidated affiliates for the periods indicated:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2019
 
2018
 
2019
 
2018
 
(Thousands of dollars)
Income Statement
 
 
 
 
 
 
 
Revenues
$
153,205

 
$
151,771

 
$
320,251

 
$
310,679

Operating expenses
$
77,704

 
$
68,120

 
$
147,504

 
$
136,521

Net income
$
68,916

 
$
77,913

 
$
159,813

 
$
162,393

 
 
 
 
 
 
 
 
Distributions paid to us (a)
$
99,527

 
$
48,424

 
$
158,990

 
$
98,240


(a) - As determined by the Northern Border Pipeline Management Committee, we received an additional distribution of $50.0 million from Northern Border Pipeline during the three months ended June 30, 2019.