NET INCOME (LOSS) PER SHARE (Narrative) (Details) - shares shares in Millions		12 Months Ended
	Dec. 15, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from computation as their effect would be antidilutive (in shares)		0.2	0.2	0.2
Stock issued during period, shares, conversion of convertible securities (in shares)	2.9
Common stock from the exercise of call option with hedge participants (in shares)	2.9
Performance Shares and Restricted Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Additional EPS shares (in shares)		0.5