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STOCK BASED AND DEFERRED COMPENSATION - Summary of Additional Information Regarding Stock Plan (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Summary of stock based compensation agreements |  |  |
Unrecognized stock-based compensation cost |  | $ 27,472 | $ 18,528
Weighted average years expense recognition period |  | 3 years 3 months 11 days | 2 years 6 months 22 days
Total stock-based awards outstanding (in shares) | [1] | 1,367,271 | 1,147,271
[1] | Includes unvested restricted stock and performance-based awards (at target level) and restricted stock units.

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