NET INCOME PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Reconciliation of the numerator and denominator of basic and diluted net income per share
Net income (loss)	$ 17,250	$ 5,426	$ 38,652	$ (29,265)
Weighted-average shares - basic	418,954	426,621	421,791	427,944
Dilutive effect of incremental shares and share equivalents	2,010	3,018	1,909	0
Weighted-average shares - diluted	420,964	429,639	423,700	427,944
Basic
Net income per share (in dollars per share)	$ 0.04	$ 0.01	$ 0.09	$ (0.07)
Diluted
Net income (loss) per share	$ 0.04	$ 0.01	$ 0.09	$ (0.07)
Employee stock options and restricted stock units outstanding	4,167	10,219	5,381	15,081