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STOCK BASED AND DEFERRED COMPENSATION - Summary of Additional Information Regarding Stock Plan (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2016 | Dec. 31, 2015
Summary of stock based compensation agreements |  |  |
Unrecognized stock-based compensation cost |  | $ 21,678 | $ 18,545
Weighted average years expense recognition period |  | 2 years 9 months 26 days | 2 years 4 months 1 day
Total stock-based awards outstanding (in shares) | [1] | 1,169,625 | 1,078,877
[1] | Includes options outstanding and unvested restricted stock and performance-based awards (at target level) and restricted stock units.

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