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DEFERRED REVENUE AND COSTS (DEFERRED REVENUE CLASSIFICATION TABLE) (DETAILS) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
DEFERRED REVENUE AND COSTS [ABSTRACT]    
Deferred revenue - current $ 23,318 $ 26,184
Deferred revenue - long-term 8,851 17,823
Total deferred revenue $ 32,169 $ 44,007