EQUITY AWARD PLAN (Stock Option Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award
Number of equity incentive plans	2
Stock Options
Number of Shares
Beginning balance (shares)	19,609,000
Options granted (shares)	1,585,000
Options exercised (shares)	(3,618,000)
Options forfeited (shares)	(534,000)
Ending balance (shares)	17,042,000	19,609,000
Options exercisable (shares)	11,278,000
Options vested and expected to vest (shares)	16,853,000
Weighted Average Exercise Price
Options outstanding (in dollars per share)	$ 5.60	$ 4.51
Options granted (in dollars per share)	$ 13.00
Options exercised (in dollars per share)	$ 2.11
Options forfeited (in dollars per share)	$ 10.94
Options exercisable (in dollars per share)	$ 3.74
Options vested and expected to vest (in dollars per share)	$ 5.54
Weighted Average Remaining Contractual Life
Weighted Average Remaining Contractual Life	6 years 8 months 16 days	7 years 3 months 20 days
Options exercisable	6 years
Options vested and expected to vest	6 years 7 months 39 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value	$ 119,782,000	$ 195,142,000
Options exercisable	97,008,000
Options vested and expected to vest	119,331,000
Weighted average grant date fair value (in dollars per share)	$ 7.42	$ 10.33	$ 3.91
Total intrinsic value of options exercised	$ 39,000,000	$ 74,100,000	$ 4,800,000