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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE | 12 Months Ended
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Dec. 31, 2020
Receivables [Abstract] |
RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE | 4. RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE Receivables
(in thousands) | December 31, 2020 |  | December 31, 2019
Accounts receivable | $ | 215,827 |  |  | $ | 199,720 |
Unbilled receivables | 207,155 |  |  | 180,219 |
Long-term unbilled receivables | 113,278 |  |  | 121,736 |
| $ | 536,260 |  |  | $ | 501,675 |
Unbilled receivables are client committed amounts for which revenue recognition precedes billing, and billing is solely subject to the passage of time. Unbilled receivables are expected to be billed in the future as follows:
(Dollars in thousands) | December 31, 2020
1 year or less | $ | 207,155 |  | 65 | %
1-2 years | 83,992 |  | 26 | %
2-5 years | 29,286 |  | 9 | %
| $ | 320,433 |  | 100 | %
Unbilled receivables based upon contract effective date:
(Dollars in thousands) | December 31, 2020
2020 | $ | 149,867 |  | 47 | %
2019 | 87,941 |  | 27 | %
2018 | 31,097 |  | 10 | %
2017 | 31,668 |  | 10 | %
2016 and prior | 19,860 |  | 6 | %
| $ | 320,433 |  | 100 | %
Major clients No client represented 10% or more of the Company’s total accounts receivable and unbilled receivables as of December 31, 2020 or December 31, 2019. Contract assets and deferred revenue
(in thousands) | December 31, 2020 |  | December 31, 2019
Contract assets (1) | $ | 15,296 |  |  | $ | 5,558 |
Long-term contract assets (2) | 7,777 |  |  | 5,420 |
| $ | 23,073 |  |  | $ | 10,978 |
Deferred revenue | $ | 232,865 |  |  | $ | 190,080 |
Long-term deferred revenue (3) | 8,991 |  |  | 5,407 |
| $ | 241,856 |  |  | $ | 195,487 |
(1) Included in other current assets. (2) Included in other long-term assets. (3) Included in other long-term liabilities. Contract assets are client committed amounts for which revenue recognized exceeds the amount billed to the client where the right to payment is subject to conditions other than the passage of time, such as completing a related performance obligation. Deferred revenue consists of billings and payments received in advance of revenue recognition. Contract assets and deferred revenue are netted at the contract level for each reporting period. The change in deferred revenue in the year ended December 31, 2020 was primarily due to new billings in advance of revenue recognition and $187.6 million of revenue recognized during the period that was included in deferred revenue on December 31, 2019.

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