Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
STOCK BASED AND DEFERRED COMPENSATION - Summary of Additional Information Regarding Stock Plan (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Summary of stock based compensation agreements    
Unrecognized stock-based compensation cost $ 22,742 $ 18,439
Weighted average years expense recognition period 2 years 5 months 16 days 2 years 5 months 23 days
Total stock-based awards outstanding (in shares) [1] 1,308,289 1,269,657
[1] Includes unvested restricted stock, performance-based awards (assuming 100% payout) and restricted stock units.