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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, 2019 | Dec. 31, 2018
Summary of stock based compensation agreements |  |  |
Unrecognized stock-based compensation cost |  | $ 24,041 | $ 24,954
Weighted average years expense recognition period |  | 2 years 5 months 1 day | 2 years 2 months 26 days
Total stock-based awards outstanding (in shares) | [1] | 1,269,806 | 1,301,745
Payout percentage |  | 100.00% |
[1] | Includes unvested restricted stock, performance-based awards (assuming 100% payout) and restricted stock units.

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