SHAREHOLDERS' EQUITY (Summary of Stock Option Activity) (Details)	9 Months Ended
	Sep. 30, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares) | shares	50,351,000
Granted (in shares) | shares	0
Exercised (in shares) | shares	(10,834,000)
Canceled (in shares) | shares	(500,000)
Outstanding, end of period (in shares) | shares	39,017,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 3.72
Granted, Weighted Average Options Exercise Price (in dollars per share) | $ / shares	0.00
Exercised, Weighted Average Options Exercise Price (in dollars per share) | $ / shares	3.47
Canceled, Weighted Average Options Exercise Price (in dollars per share) | $ / shares	2.45
Outstanding, end of period (in dollars per share) | $ / shares	$ 3.80