Annual report pursuant to Section 13 and 15(d)

Revenue Recognition

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Revenue Recognition
 12 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenue Recognition
Disaggregated Revenue
Our revenues are derived from contract services performed for DoD agencies or federal civilian agencies and from the delivery of products to our customers. Our customers also include various other government agencies and commercial clients.

A summary of revenues for our operating segments by customer for the years ended December 31, 2020, 2019 and 2018 are as follows (in thousands):
Year Ended December 31, 2020 Fleet Aviation Federal and Defense Total
DoD $ 20,744  $ 1,093  $ 214,560  $ 236,397 
Other government 178,693  282  37,982  216,957 
Commercial 42,733  163,695  1,877  208,305 
Total $ 242,170  $ 165,070  $ 254,419  $ 661,659 
Year Ended December 31, 2019
DoD $ 24,246  $ 3,775  $ 276,313  $ 304,334 
Other government 168,113  1,885  35,777  205,775 
Commercial 22,161  218,886  1,471  242,518 
Total $ 214,520  $ 224,546  $ 313,561  $ 752,627 
Year Ended December 31, 2018
DoD $ 24,280  $ 7,387  $ 302,827  $ 334,494 
Other government 176,200  2,172  33,746  212,118 
Commercial 14,329  135,864  413  150,606 
Total $ 214,809  $ 145,423  $ 336,986  $ 697,218 

We changed our disaggregated revenue by type presentation below in the first quarter of 2020 to better align with our operating segments. Revenues from our Aviation and Fleet segment are derived from repair and distribution services primarily through shorter term purchase orders from customers. Our Federal and Defense segment's revenue results from services provided on longer term contracts, including cost plus, fixed price and time and materials contract types. This change provides a clearer picture of the nature of each segment's contractual arrangements, how revenues derived from those contracts are affected by economic factors, and underlying performance trends impacting each segment. Additionally, the presentation is more in-line with how each segments' results are evaluated by our Chief Executive Officer in deciding how to allocate resources and evaluate performance.

The change in disaggregated revenue presentation did not result in any changes in our reported segments and had no effect on the reported results of operations.
A summary of revenues by type for our operating segments for the year ended December 31, 2020, 2019 and 2018 are as follows (in thousands):
Year Ended December 31, 2020 Fleet Aviation Federal and Defense Total
Repair $ —  $ 82,445  $ —  $ 82,445 
Distribution 242,170  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
Repair $ —  $ 119,044  $ —  $ 119,044 
Distribution 214,520  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 
Year Ended December 31, 2018
Repair $ —  $ 55,960  $ —  $ 55,960 
Distribution 214,809  89,463  —  304,272 
Cost Plus Contract —  —  188,867  188,867 
Fixed Price Contract —  —  70,669  70,669 
T&M Contract —  —  77,450  77,450 
Total $ 214,809  $ 145,423  $ 336,986  $ 697,218 
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 decreased from $46.3 million at December 31, 2019 to $22.4 million at December 31, 2020, primarily due to the billings of our customers in excess of revenue recognized as performance obligations were satisfied. Contract liabilities, which are included in accrued expenses and other current liabilities in our consolidated balance sheet, were $5.0 million at December 31, 2019 and $10.1 million at December 31, 2020. For the year ended December 31, 2020 and 2019, we recognized revenue of $2.2 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 over time accounted for approximately 51% and 57% of our revenues for the year ended December 31, 2020 and 2019, respectively, primarily related to revenues in our Federal and Defense segment and for MRO services in our Aviation segment. Revenues from products and services transferred to customers at a point in time accounted for approximately 49% and 43% of our revenues for the year ended December 31, 2020 and 2019, 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.
As of December 31, 2020, the aggregate amount of transaction prices allocated to unsatisfied or partially unsatisfied performance obligations was $183 million. Performance obligations expected to be satisfied within one year and greater than
one year are 92% and 8%, 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, 2020, revenue recognized from performance obligations satisfied in prior periods was not material.