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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
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Mar. 31, 2016 | Dec. 31, 2015
Summary of stock based compensation agreements |  |  |
Unrecognized stock-based compensation cost |  | $ 29,053 | $ 18,545
Weighted average years expense recognition period |  | 3 years 4 months 2 days | 2 years 4 months 1 day
Total equity awards outstanding (in shares) | [1] | 1,271,515 | 1,078,877
[1] | Includes options outstanding and unvested restricted stock and performance-based awards and restricted stock units.

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