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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE | 3 Months Ended
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Mar. 31, 2021
Receivables [Abstract] |
RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE | NOTE 4. RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE Receivables
(in thousands) | March 31, 2021 |  | December 31, 2020
Accounts receivable | $ | 159,324 |  |  | $ | 215,827 |
Unbilled receivables | 228,603 |  |  | 207,155 |
Long-term unbilled receivables | 108,048 |  |  | 113,278 |
| $ | 495,975 |  |  | $ | 536,260 |
Unbilled receivables Unbilled receivables are client-committed amounts for which revenue recognition precedes billing, and billing is solely subject to the passage of time. Unbilled receivables by expected billing date:
(Dollars in thousands) | March 31, 2021
1 year or less | $ | 228,603 |  | 68 | %
1-2 years | 80,688 |  | 24 | %
2-5 years | 27,360 |  | 8 | %
| $ | 336,651 |  | 100 | %
Unbilled receivables by contract effective date:
(Dollars in thousands) | March 31, 2021
2021 | $ | 46,625 |  | 14 | %
2020 | 163,226 |  | 48 | %
2019 | 63,600 |  | 19 | %
2018 | 28,885 |  | 9 | %
2017 and prior | 34,315 |  | 10 | %
| $ | 336,651 |  | 100 | %
Major clients No client represented 10% or more of the Company’s total receivables as of March 31, 2021 or December 31, 2020. Contract assets Contract assets are client-committed amounts for which revenue recognized exceeds the amount billed to the client, and billing is subject to conditions other than the passage of time, such as completing a related performance obligation.
(in thousands) | March 31, 2021 |  | December 31, 2020
Contract assets (1) | $ | 13,454 |  |  | $ | 15,296 |
Long-term contract assets (2) | 7,284 |  |  | 7,777 |
| $ | 20,738 |  |  | $ | 23,073 |
(1) Included in other current assets. (2) Included in other long-term assets. Deferred revenue Deferred revenue consists of billings and payments received in advance of revenue recognition.
(in thousands) | March 31, 2021 |  | December 31, 2020
Deferred revenue | $ | 244,170 |  |  | $ | 232,865 |
Long-term deferred revenue (1) | 7,565 |  |  | 8,991 |
| $ | 251,735 |  |  | $ | 241,856 |
(1) Included in other long-term liabilities. The change in deferred revenue in the three months ended March 31, 2021 was primarily due to new billings in advance of revenue recognition offset by $107.0 million of revenue recognized that was included in deferred revenue as of December 31, 2020.

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