v3.21.2
REVENUE FROM CONTRACTS WITH CUSTOMERS
 6 Months Ended
Jun. 30, 2021
Revenue from Contract with Customer [Abstract]  
REVENUE FROM CONTRACTS WITH CUSTOMERS REVENUE FROM CONTRACTS WITH CUSTOMERS
Contract Assets and Contract Liabilities
The following table provides information about contract assets and contract liabilities from contracts with customers:
20212020
Contract AssetsContract LiabilitiesContract AssetsContract Liabilities
(Thousands of Dollars)
Balances as of January 1:
Current portion$2,694 $(22,019)$2,140 $(21,083)
Noncurrent portion932 (47,537)1,003 (40,289)
Total 3,626 (69,556)3,143 (61,372)
Activity:
Additions1,898 (19,401)2,670 (34,156)
Transfer to accounts receivable(2,055)— (2,258)— 
Transfer to revenues(250)25,987 (125)29,848 
Total (407)6,586 287 (4,308)
Balances as of June 30:
Current portion2,590 (17,002)2,218 (20,235)
Noncurrent portion629 (45,968)1,212 (45,445)
Total $3,219 $(62,970)$3,430 $(65,680)

Remaining Performance Obligations
The following table presents our estimated revenue from contracts with customers for remaining performance obligations that has not yet been recognized, representing our contractually committed revenue as of June 30, 2021 (in thousands of dollars):
2021 (remaining)$245,634 
2022399,345 
2023280,095 
2024189,149 
2025130,697 
Thereafter176,403 
Total$1,421,323 

Our contractually committed revenue, for purposes of the tabular presentation above, is generally limited to customer service contracts that have fixed pricing and fixed volume terms and conditions, generally including contracts with payment obligations for take-or-pay minimum volume commitments.
Disaggregation of Revenues
The following table disaggregates our revenues:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(Thousands of Dollars)
Pipeline segment:
Crude oil pipelines $82,034 $79,110 $156,622 $170,832 
Refined products and ammonia pipelines (excluding lessor revenues)110,872 86,173 205,512 189,307 
Total pipeline segment revenues from contracts with customers
192,906 165,283 362,134 360,139 
Lessor revenues— 825 — 1,650 
Total pipeline segment revenues192,906 166,108 362,134 361,789 
Storage segment:
Throughput terminals35,143 32,199 59,937 70,922 
Storage terminals (excluding lessor revenues)73,742 76,880 147,158 151,046 
Total storage segment revenues from contracts with customers
108,885 109,079 207,095 221,968 
Lessor revenues10,363 10,328 20,727 20,656 
Total storage segment revenues119,248 119,407 227,822 242,624 
Fuels marketing segment:
Revenues from contracts with customers
114,939 54,025 198,794 127,927 
Consolidation and intersegment eliminations— — (11)(9)
Total revenues$427,093 $339,540 $788,739 $732,331