Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Summary of stock based compensation agreements    
Unrecognized stock-based compensation cost $ 18,545 $ 20,577
Weighted average years expense recognition period 2 years 4 months 1 day 2 years 1 month 10 days
Total equity awards outstanding (in shares) [1] 1,078,877 1,255,714
[1] Includes options outstanding and unvested restricted stock awards and restricted stock units.