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DEFERRED REVENUE AND COSTS (DEFERRED COSTS CLASSIFICATION TABLE) (DETAILS) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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DEFERRED REVENUE AND COSTS [ABSTRACT] |  |
Deferred costs - current | $ 13,649 | $ 14,755
Deferred costs - long-term | 9,654 | 8,124
Total deferred costs | $ 23,303 | $ 22,879

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