INCOME (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share
Net income (loss)	$ 12,985	$ 6,021
Weighted average number of common shares	298,242	297,255
Net income (loss) per share	$ 0.04	$ 0.02
Weighted average common shares outstanding (thousands) (note 10):
Effect of employee stock-based awards (in shares)	312	11
Diluted (in shares)	298,554	297,266
Net income (loss) per share:
Diluted (in dollars per share)	$ 0.04	$ 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)	4,600	5
Average exercise price of options outstanding (in dollars per share)	$ 3.26	$ 3.32
Other 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)	300