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Revenue Recognition
 12 Months Ended
Dec. 31, 2021
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, various government agencies, the DoD or federal civilian agencies.

A summary of revenues by customer for our operating segments for the years ended December 31, 2021, 2020 and 2019 are as follows (in thousands):
Year Ended December 31, 2021FleetAviationFederal and DefenseTotal
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 
Year Ended December 31, 2019
Commercial$22,161 $218,886 $1,471 $242,518 
DoD24,246 3,775 276,313 304,334 
Other government168,113 1,885 35,777 205,775 
Total$214,520 $224,546 $313,561 $752,627 
A summary of revenues by type for our operating segments for the year ended December 31, 2021, 2020 and 2019 are as follows (in thousands):
Year Ended December 31, 2021FleetAviationFederal and DefenseTotal
Repair$— $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 $661,659 
Year Ended December 31, 2019 (a)
Repair$— $119,044 $— $119,044 
Distribution214,520 105,502 — 320,022 
Cost Plus Contract— — 144,600 144,600 
Fixed Price Contract— — 78,163 78,163 
T&M Contract— — 90,798 90,798 
Total$214,520 $224,546 $313,561 $752,627 
(a) Historical presentation has been realigned to conform to its current period presentation and did not affect the reported results of operations for each reported segment.
Contract Balances
Billed receivables, unbilled receivables (contract assets), and contract liabilities are the results of revenue recognition, customer billing, and timing of payment receipts. Billed receivables, net, represent unconditional rights to consideration under the terms of the contract and include amounts billed and currently due from our customers. Unbilled receivables represent our right to consideration in exchange for goods or services that we have transferred to the customer prior to us having the right to payment for such goods or services. Contract liabilities are recorded when customers remit contractual cash payments in advance of us satisfying performance obligations under contractual arrangements, including those with performance obligations to be satisfied over a period of time.
We present our unbilled receivables and contract liabilities on a contract-by-contract basis. If a contract liability exists, it is netted against the unbilled receivables balance for that contract. Unbilled receivables increased to $31.9 million as of December 31, 2021 from $22.4 million as of December 31, 2020, primarily due to performance obligations satisfied in excess of billings and unbilled receivables acquired as part of the HSS acquisition. Contract liabilities, which are included in accrued expenses and other current liabilities in our consolidated balance sheet, were $7.1 million as of December 31, 2021 and $10.1 million as of December 31, 2020. For the year ended December 31, 2021 and 2020, we recognized revenue of $5.1 million and $2.2 million, respectively, that was previously included in the beginning balance of contract liabilities.

Performance Obligations

Our performance obligations are satisfied over time as work progresses or at a point in time. Revenues from products and services transferred to customers at a point in time accounted for approximately 54% and 49% of our revenues for the year ended December 31, 2021 and 2020, respectively. The majority of our revenue recognized at a point in time is for the sale of vehicle and aircraft parts in our Fleet and Aviation segments. Revenues from products and services transferred to customers over time accounted for approximately 46% and 51% of our revenues for the year ended December 31, 2021 and 2020, respectively, primarily related to revenues in our Federal and Defense segment and for MRO services in our Aviation segment.
As of December 31, 2021, the aggregate amount of transaction prices allocated to unsatisfied or partially unsatisfied performance obligations was $185 million. Performance obligations expected to be satisfied within one year and greater than one year are 86% and 14%, 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, 2021, revenue recognized from performance obligations satisfied in prior periods was not material.