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SEGMENT INFORMATION
 12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
SEGMENT INFORMATION SEGMENT INFORMATION
Our reportable business segments consist of the pipeline, storage and fuels marketing segments. Our segments represent strategic business units that offer different services and products. We evaluate the performance of each segment based on its respective operating income, before general and administrative expenses and certain non-segmental depreciation and amortization expense. General and administrative expenses are not allocated to the operating segments since those expenses relate primarily to the overall management at the entity level. Our principal operations include the transportation of petroleum products and anhydrous ammonia, and the terminalling, storage and marketing of petroleum products. Intersegment revenues result from storage agreements with wholly owned subsidiaries of NuStar Energy at rates consistent with the rates charged to third parties for storage.
Results of operations for the reportable segments were as follows:
 Year Ended December 31,
 202020192018
 (Thousands of Dollars)
Revenues:
Pipeline$718,823 $701,830 $611,065 
Storage:
Third parties494,396 453,976 443,546 
Intersegment46 25 42 
Total storage494,442 454,001 443,588 
Fuels marketing268,345 342,215 465,651 
Consolidation and intersegment eliminations(46)(25)(42)
Total revenues$1,481,564 $1,498,021 $1,520,262 
Depreciation and amortization expense:
Pipeline$177,384 $166,991 $153,943 
Storage99,092 97,573 93,345 
Total segment depreciation and amortization expense276,476 264,564 247,288 
Other depreciation and amortization expense8,625 8,360 8,604 
Total depreciation and amortization expense$285,101 $272,924 $255,892 
Operating income:
Pipeline$118,429 $332,480 $272,695 
Storage189,781 154,105 155,708 
Fuels marketing12,233 20,578 15,964 
Consolidation and intersegment eliminations— (32)32 
Total segment operating income320,443 507,131 444,399 
General and administrative expenses102,716 107,855 100,067 
Other depreciation and amortization expense8,625 8,360 8,604 
Total operating income$209,102 $390,916 $335,728 
 
Revenues by geographic area are shown in the table below:
 Year Ended December 31,
 202020192018
 (Thousands of Dollars)
United States$1,441,892 $1,465,135 $1,481,844 
Foreign39,672 32,886 38,418 
Consolidated revenues$1,481,564 $1,498,021 $1,520,262 

For the years ended December 31, 2020, 2019 and 2018, Valero Energy Corporation accounted for approximately 20%, or $295.1 million, 21%, or $307.2 million, and 20%, or $303.7 million, of our revenues, respectively. These revenues were included in all of our reportable business segments. No other single customer accounted for 10% or more of our consolidated revenues.

Total amounts of property, plant and equipment, net by geographic area were as follows:
 December 31,
 20202019
 (Thousands of Dollars)
United States$3,837,550 $4,000,647 
Foreign119,962 118,332 
Consolidated property, plant and equipment, net$3,957,512 $4,118,979 

Total assets by reportable segment were as follows:
 December 31,
 20202019
 (Thousands of Dollars)
Pipeline$3,609,508 $3,884,819 
Storage1,897,167 2,082,832 
Fuels marketing31,967 31,064 
Total segment assets5,538,642 5,998,715 
Other partnership assets278,376 187,277 
Total consolidated assets$5,817,018 $6,185,992 

Capital expenditures, including acquisitions, by reportable segment were as follows:
 Year Ended December 31,
 202020192018
 (Thousands of Dollars)
Pipeline$122,512 $387,702 $288,035 
Storage71,788 141,972 202,782 
Other partnership assets3,779 3,894 4,137 
Total capital expenditures$198,079 $533,568 $494,954 
 
Capital expenditures have not been adjusted to separately disclose those capital expenditures related to discontinued operations, which are included in the storage segment totaling $28.0 million and $114.8 million for the years ended December 31, 2019 and 2018, respectively.