Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
STOCK BASED AND DEFERRED COMPENSATION - Summary of Additional Information Regarding Stock Plan (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Summary of stock based compensation agreements    
Unrecognized stock-based compensation cost $ 21,920 $ 18,528
Weighted average years expense recognition period 2 years 9 months 2 years 6 months 22 days
Total stock-based awards outstanding (in shares) [1] 1,302,176 1,147,271
[1] Includes unvested restricted stock, performance-based awards (at target level) and restricted stock units.