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UNCONSOLIDATED AFFILIATES (Notes)
 9 Months Ended
Sep. 30, 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 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 

We incurred expenses in transactions with unconsolidated affiliates of $25.4 million and $16.2 million for the three months ended September 30, 2022 and 2021, respectively, and $55.5 million and $44.2 million for the nine months ended September 30, 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.