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REVENUE FROM CONTRACTS WITH CUSTOMERS
 12 Months Ended
Dec. 31, 2022
Revenue from Contract with Customer [Abstract]  
REVENUE FROM CONTRACTS WITH CUSTOMERS REVENUE FROM CONTRACTS WITH CUSTOMERS
A summary of our total revenues disaggregated by major service line and timing of revenue recognition is presented below for each of our reportable segments for the twelve months ended December 31, 2022, 2021, and 2020, as follows (dollars in thousands):
Twelve Months Ended December 31, 2022
NASTGlobal ForwardingAll Other and CorporateTotal
Major service lines:
Transportation and logistics services(1)
$15,827,467 $6,812,008 $876,909 $23,516,384 
Sourcing(2)
— — 1,180,241 1,180,241 
Total $15,827,467 $6,812,008 $2,057,150 $24,696,625 
Twelve Months Ended December 31, 2021
NASTGlobal ForwardingAll Other and CorporateTotal
Major service lines:
Transportation and logistics services(1)
$14,507,917 $6,729,790 $808,867 $22,046,574 
Sourcing(2)
— — 1,055,564 1,055,564 
Total $14,507,917 $6,729,790 $1,864,431 $23,102,138 
Twelve Months Ended December 31, 2020
NASTGlobal ForwardingAll Other and CorporateTotal
Major service lines:
Transportation and logistics services(1)
$11,312,553 $3,100,525 $734,484 $15,147,562 
Sourcing(2)
— — 1,059,544 1,059,544 
Total $11,312,553 $3,100,525 $1,794,028 $16,207,106 
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(1) Transportation and logistics services performance obligations are completed over time.
(2) Sourcing performance obligations are completed at a point in time.

We typically do not receive consideration and amounts are not due from our customer prior to the completion of our performance obligations and as such contract liabilities as of December 31, 2022 and 2021, and revenue recognized in the twelve months ended December 31, 2022, 2021, and 2020, resulting from contract liabilities were not significant. Contract assets and accrued expenses—transportation expense fluctuate from period to period primarily based upon shipments in-transit at period end and the timing of customer invoicing.
Approximately 93 percent, 93 percent, and 91 percent of our total revenues for the twelve months ended December 31, 2022, 2021, and 2020, respectively, are attributable to arranging for the transportation of our customers’ freight for which we transfer control and satisfy our performance obligation over the requisite transit period. A days in transit output method is used to measure the progress of our performance as of the reporting date. We determine the transit period based upon the departure date and the delivery date, which may be estimated if delivery has not occurred as of the reporting date. Determining the transit period and how much of it has been completed as of the reporting date may require management to make judgments that affect the timing of revenue recognized. We have determined that revenue recognition over the transit period provides a faithful depiction of the transfer of goods and services to our customer as our obligation is performed over the transit period. The transaction price for our performance obligation under these arrangements is generally fixed and readily determinable upon contract inception and is not contingent upon the occurrence or non-occurrence of another event.
Approximately five percent, five percent, and seven percent of our total revenues for the twelve months ended December 31, 2022, 2021, and 2020, respectively, are attributable to buying, selling, and/or marketing of produce including fresh fruits, vegetables, and other value-added perishable items. Total revenues for these transactions are recognized at a point in time upon completion of our performance obligation, which is generally when the produce is received by our customer. The transaction price for our performance obligation under these arrangements is generally fixed and readily determinable upon contract inception and is not contingent upon the occurrence or non-occurrence of another event.
Approximately two percent of our total revenues for the twelve months ended December 31, 2022, 2021, and 2020, respectively, are attributable to value-added logistics services, such as customs brokerage, fee-based managed services, warehousing services, small parcel, and supply chain consulting and optimization services. Total revenues for these services are recognized over time as we complete our performance obligation. Transaction price is determined and allocated to these performance obligations at their fixed fee or agreed upon rate multiplied by their associated measure of progress, which may be transactional volumes, labor hours, or time elapsed.
We expense incremental costs of obtaining customer contracts (i.e., sales commissions) due to the short duration of our arrangements as the amortization period of such amounts is expected to be less than one year. These amounts are included within personnel expenses in our consolidated statements of operations and comprehensive income. In addition, we do not disclose the aggregate amount of transaction price allocated to performance obligations that are unsatisfied as of the end of the period, as our contracts have an expected length of one year or less. Finally, for certain of our performance obligations such as fee-based managed services, supply chain consulting and optimization services, and warehousing services, we have recognized revenue in the amount for which we have the right to invoice our customer as we have determined this amount corresponds directly with the value provided to the customer for our performance completed to date.