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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE | 12 Months Ended
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Dec. 31, 2019
Receivables [Abstract] |
RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE | 4. RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE Receivables
(in thousands) | December 31, 2019 |  | December 31, 2018
Accounts receivable | $ | 199,720 |  |  | $ | 180,872 |
Unbilled receivables | 180,219 |  |  | 172,656 |
Long-term unbilled receivables | 121,736 |  |  | 151,237 |
| $ | 501,675 |  |  | $ | 504,765 |
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, 2019
1 year or less | $ | 180,219 |  | 60 | %
1-2 years | 91,132 |  | 30 | %
2-5 years | 30,604 |  | 10 | %
| $ | 301,955 |  | 100 | %
Contract assets and deferred revenue
(in thousands) | December 31, 2019 |  | December 31, 2018
Contract assets (1) | $ | 5,558 |  |  | $ | 3,711 |
Long-term contract assets (2) | 5,420 |  |  | 2,543 |
| $ | 10,978 |  |  | $ | 6,254 |
Deferred revenue | $ | 190,080 |  |  | $ | 185,145 |
Long-term deferred revenue (3) | 5,407 |  |  | 5,344 |
| $ | 195,487 |  |  | $ | 190,489 |
(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 and the right to payment is subject to conditions other than the passage of time, such as the completion of 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, 2019 was primarily due to new billings in advance of revenue recognition, partially offset by revenue recognized during the period that was included in deferred revenue at December 31, 2018. Major clients No client represented 10% or more of the Company’s total accounts receivable and unbilled receivables as of December 31, 2019 or December 31, 2018.

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