SHAREHOLDERS' EQUITY (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Stock options
Option Exercises
Options exercised during period (in shares)	283,797	211,005
Net proceeds from options exercised during the period	$ 2.6	$ 1.4
Restricted stock units
Restricted Stock Units
Vested (in shares)	0	0