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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE (Tables) | 12 Months Ended
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Dec. 31, 2018
Receivables [Abstract] |
Summary of Receivable | Receivables
(in thousands) | December 31, 2018 |  | December 31, 2017
Accounts receivable | $ | 180,872 |  |  | $ | 222,735 |
Unbilled receivables | 172,656 |  |  | 160,084 |
Long-term unbilled receivables | 151,237 |  |  | 160,708 |
| $ | 504,765 |  |  | $ | 543,527 |
Summary of Unbilled Receivables | Unbilled receivables are expected to be billed in the future as follows:
(Dollars in thousands) | December 31, 2018
1 Year or less | $ | 172,656 |  | 54 | %
1-2 Years | 95,013 |  | 29 | %
2-5 Years | 56,224 |  | 17 | %
| $ | 323,893 |  | 100 | %
Summary of Contract Assets and Deferred Revenue | Contract assets and deferred revenue
(in thousands) | December 31, 2018 |  | December 31, 2017
Contract assets (1) | $ | 3,711 |  |  | $ | 914 |
Long-term contract assets (2) | 2,543 |  |  | — |
| $ | 6,254 |  |  | $ | 914 |
Deferred revenue | $ | 185,145 |  |  | $ | 165,850 |
Long-term deferred revenue (3) | 5,344 |  |  | 3,706 |
| $ | 190,489 |  |  | $ | 169,556 |
(1) Included in other current assets. (2) Included in other long-term assets. (3) Included in other long-term liabilities.

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