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Revenue Recognition | 12 Months Ended
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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.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 + Details
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