Quarterly report pursuant to Section 13 or 15(d)

STOCK BASED AND DEFERRED COMPENSATION - Summary of Additional Information Regarding Stock Plan (Details)

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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, 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.