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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE - Summary of Contract Assets and Deferred Revenue (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Receivables [Abstract] |  |
Contract assets | $ 3,770 | $ 3,711
Long-term contract assets | 2,190 | 2,543
Total contract assets | 5,960 | 6,254
Deferred revenue | 169,009 | 185,145
Long-term deferred revenue | 4,342 | 5,344
Total deferred revenue | $ 173,351 | $ 190,489

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