INCOME (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share
Net (loss) income	$ (1,712)	$ 8,353	$ (4,728)	$ 21,338
Weighted average number of common shares	308,523	298,237	304,074	298,239
Effect of employee stock-based awards		1,554		992
Diluted shares outstanding	308,523	299,791	304,074	299,231
Net income (loss) per share:
Net income (loss) per share	$ (0.01)	$ 0.03	$ (0.02)	$ 0.07
Diluted (in dollars per share)	$ (0.01)	$ 0.03	$ (0.02)	$ 0.07
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)	2,300		3,000
Average exercise price of options outstanding (in dollars per share)	$ 4.20		$ 3.73