DEFERRED REVENUE AND COSTS (DEFERRED COSTS CLASSIFICATION TABLE) (DETAILS) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
DEFERRED REVENUE AND COSTS [ABSTRACT]
Deferred costs - current	$ 14,755	$ 16,905
Deferred costs - long-term	8,124	11,472
Total deferred costs	$ 22,879	$ 28,377