INCOME (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share
Net income (loss)	$ 4,208	$ 2,633	$ 25,546	$ (5,462)
Weighted average number of common shares	298,510	300,530	298,330	300,420
Weighted average common shares outstanding (thousands) (note 11):
Effect of employee stock-based awards (in shares)	2,535		1,665
Diluted (in shares)	301,045	300,530	299,995	300,420
Net income (loss) per share:
Net income (loss) per share	$ 0.01	$ 0.01	$ 0.09	$ (0.02)
Diluted (in dollars per share)	$ 0.01	$ 0.01	$ 0.09	$ (0.02)
Options
Antidilutive Securities Excluded from Computation of Earnings Per Share
Options outstanding not included in the computation of diluted weighted average shares because their effect would have been anti-dilutive (in shares)	1,300	4,500	2,400	4,400
Average exercise price of options outstanding (in dollars per share)	$ 5.18	$ 3.34	$ 4.14	$ 3.37