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Revenue Recognition
 12 Months Ended
Dec. 31, 2022
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenue Recognition
Disaggregated Revenue
Our revenues are derived from the delivery of products to our customers and from services performed for commercial customers, the DoD, and various other government agencies.

A summary of revenues by customer for each of our operating segments for the years ended December 31, 2022, 2021 and 2020 were as follows (in thousands):
Year Ended December 31, 2022FleetAviationFederal and DefenseTotal
Commercial$104,162 $403,155 $583 $507,900 
DoD3,286 — 224,436 227,722 
Other government153,888 4,957 55,295 214,140 
Total$261,336 $408,112 $280,314 $949,762 
Year Ended December 31, 2021
Commercial$73,606 $245,380 $3,332 $322,318 
DoD12,689 — 220,733 233,422 
Other government147,237 2,472 45,404 195,113 
Total$233,532 $247,852 $269,469 $750,853 
Year Ended December 31, 2020
Commercial$42,733 $163,695 $1,877 $208,305 
DoD20,744 1,093 214,560 236,397 
Other government178,693 282 37,982 216,957 
Total$242,170 $165,070 $254,419 $661,659 
A summary of revenues by type for each of our operating segments for the year ended December 31, 2022, 2021 and 2020 were as follows (in thousands):
Year Ended December 31, 2022FleetAviationFederal and DefenseTotal
Repair$— $107,399 $— $107,399 
Distribution261,336 300,713 — 562,049 
Cost Plus Contract— — 139,958 139,958 
Fixed Price Contract— — 98,674 98,674 
T&M Contract— — 41,682 41,682 
Total$261,336 $408,112 $280,314 $949,762 
Year Ended December 31, 2021
Repair$— $75,725 $— $75,725 
Distribution233,532 172,127 — 405,659 
Cost Plus Contract— — 93,694 93,694 
Fixed Price Contract— — 105,495 105,495 
T&M Contract— — 70,280 70,280 
Total$233,532 $247,852 $269,469 $750,853 
Year Ended December 31, 2020
Repair$— $82,445 $— $82,445 
Distribution242,170 82,625 — 324,795 
Cost Plus Contract— — 79,064 79,064 
Fixed Price Contract— — 138,406 138,406 
T&M Contract— — 36,949 36,949 
Total$242,170 $165,070 $254,419 $661,659 
Contract Balances
Receivables, net, represent rights to consideration, which are unconditional other than the passage of time. A contract asset is a right to consideration that is conditional upon factors other than the passage of time. Contract assets include unbilled receivables and contract retentions but exclude billed receivables. Contract liabilities include customer advances, billings in excess of revenues and deferred revenue. Contract assets and liabilities are recorded net on a contract-by-contract basis and are generally classified as current based on our contract operating cycle.
Receivables, net and unbilled receivables as of December 31, 2022 and 2021, respectively, were as follows (in thousands):
 20222021
Receivables, net(1)
$103,193 $76,587 
Unbilled receivables38,307 31,882 
Total$141,500 $108,469 
(1) Net of allowance of $2.1 million and $1.7 million as of December 31, 2022 and 2021, respectively.
Unbilled receivables increased to $38.3 million as of December 31, 2022 from $31.9 million as of December 31, 2021, primarily due to revenue recognized in excess of billings.
Contract liabilities, which are included in accrued expenses and other current liabilities in our consolidated balance sheet, were $6.4 million as of December 31, 2022 and $7.1 million as of December 31, 2021. For the year ended December 31, 2022 and 2021, we recognized revenue of $3.9 million and $5.1 million, respectively, that was previously included in the beginning balance of contract liabilities.
Performance Obligations

Our performance obligations are satisfied either at a point in time or over time as work progresses. Revenues from products and services transferred to customers at a point in time are primarily related to the sales of vehicle and aircraft parts in our Fleet and Aviation segments. Revenue recognized at a point in time accounted for approximately 59% and 54% of our revenues for the
year ended December 31, 2022 and 2021, respectively. Revenues from products and services transferred to customers over time are primarily related to revenues in our Federal and Defense segment and MRO services in our Aviation segment. Revenues recognized over time accounted for approximately 41% and 46% of our revenues for the year ended December 31, 2022 and 2021, respectively.
As of December 31, 2022, the aggregate amount of transaction prices allocated to unsatisfied or partially unsatisfied performance obligations was $187 million. Performance obligations expected to be satisfied within one year and greater than one year are 97% and 3%, respectively. We have applied the practical expedient for certain parts sales and MRO services to exclude the amount of remaining performance obligations for (i) contracts with an original expected term of one year or less or (ii) contracts for which we recognize revenue in proportion to the amount we have the right to invoice for services performed.

During the year ended December 31, 2022, revenue recognized from performance obligations satisfied in prior periods was not material.