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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE (Tables) | 12 Months Ended
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Dec. 31, 2020
Receivables [Abstract] |
Summary of Accounts Receivable and Unbilled Receivable | 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 |
Summary of Unbilled Receivables | 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 | %
Summary of Unbilled Receivables Based Upon Contract Effective Date | 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 | %
Summary of Contract Assets and Deferred Revenue | 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.

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