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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE (Tables) | 6 Months Ended
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Jun. 30, 2019
Receivables [Abstract] |
Summary of Receivable | Receivables
(in thousands) | June 30, 2019 |  | December 31, 2018
Accounts receivable | $ | 134,965 |  |  | $ | 180,872 |
Unbilled receivables | 169,554 |  |  | 172,656 |
Long-term unbilled receivables | 117,889 |  |  | 151,237 |
| $ | 422,408 |  |  | $ | 504,765 |
Summary of Unbilled Receivables | Unbilled receivables are expected to be billed in the future as follows:
(Dollars in thousands) | June 30, 2019
1 year or less | $ | 169,554 |  | 59 | %
1-2 years | 79,128 |  | 28 | %
2-5 years | 38,761 |  | 13 | %
| $ | 287,443 |  | 100 | %
Summary of Contract Assets and Deferred Revenue | Contract assets and deferred revenue
(in thousands) | June 30, 2019 |  | December 31, 2018
Contract assets (1) | $ | 3,770 |  |  | $ | 3,711 |
Long-term contract assets (2) | 2,190 |  |  | 2,543 |
| $ | 5,960 |  |  | $ | 6,254 |
(1) Included in other current assets. (2) Included in other long-term assets.
(in thousands) | June 30, 2019 |  | December 31, 2018
Deferred revenue | $ | 169,009 |  |  | $ | 185,145 |
Long-term deferred revenue (1) | 4,342 |  |  | 5,344 |
| $ | 173,351 |  |  | $ | 190,489 |
(1) Included in other long-term liabilities.

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