NET INCOME PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Reconciliation of the numerator and denominator of basic and diluted net income per share
Net income (loss)	$ 19,236	$ 12,976	$ 21,402	$ (34,691)
Weighted-average shares - basic	421,090	428,239	423,233	428,617
Dilutive effect of incremental shares and share equivalents	1,744	2,297	1,643	0
Weighted-average shares - diluted	422,834	430,536	424,876	428,617
Basic
Net income per share (in dollars per share)	$ 0.05	$ 0.03	$ 0.05	$ (0.08)
Diluted
Net income (loss) per share	$ 0.05	$ 0.03	$ 0.05	$ (0.08)
Employee stock options and restricted stock units outstanding	4,116	6,923	4,940	9,377