SHAREHOLDERS' EQUITY (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Stock options
Option Exercises
Options exercised during period (in shares)	109,545	529,555	229,847	813,352
Net proceeds from options exercised during the period	$ 700	$ 3,400	$ 1,320	$ 6,000
Restricted stock units
Restricted Stock Units
Number of shares issued due to vesting (in shares)	168,846	42,068	201,545	42,068