NET INCOME PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of the numerator and denominator of basic and diluted net income per share
Net income (loss)	$ (22,055)	$ 30,445	$ 314,990
Weighted-average shares - basic	427,460	433,017	455,629
Dilutive effect of incremental shares and share equivalents	0	4,565	7,044
Weighted-average shares - diluted	427,460	437,582	462,673
Basic
Net income per share (in dollars per share)	$ (0.05)	$ 0.07	$ 0.69
Diluted
Net income per share (in dollars per share)	$ (0.05)	$ 0.07	$ 0.68
Anti-dilutive securities not included in the "Weighted-average shares - diluted" used for calculation of diluted net income per share
Employee stock options and restricted stock units outstanding (in shares)	11,860	4,718	1,977