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UNCONSOLIDATED AFFILIATES (Notes)
3 Months Ended
Mar. 31, 2022
Equity Method Investments and Joint Ventures [Abstract]  
UNCONSOLIDATED AFFILIATES UNCONSOLIDATED AFFILIATES
Equity in Net Earnings from Investments - The following table sets forth our equity in net earnings from investments for the periods indicated:
Three Months Ended
March 31,
 20222021
 
(Thousands of dollars)
Northern Border Pipeline$20,125 $20,239 
Roadrunner9,141 7,749 
Overland Pass Pipeline5,008 2,972 
Other2,066 2,360 
Equity in net earnings from investments$36,340 $33,320 

We incurred expenses in transactions with unconsolidated affiliates of $14.5 million and $15.6 million for the three months ended March 31, 2022 and 2021, respectively, primarily related to Northern Border Pipeline and Overland Pass Pipeline. Revenue earned and accounts receivable from, and accounts payable to, our equity-method investees were not material.

We have an operating agreement with Roadrunner that provides for reimbursement or payment to us for management services and certain operating costs. Reimbursements and payments from Roadrunner included in operating income in our Consolidated Statements of Income for all periods presented were not material.