DEBT (Convertible Note Hedge and Warrant Transactions) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions			12 Months Ended
	Jul. 24, 2020	May 31, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jul. 21, 2020	May 24, 2017
Debt Instrument [Line Items]
Payment of convertible note hedge transactions			$ 124,200	$ 0	$ 0
Share price (in dollars per share)			$ 273.79
Proceeds from issuance of warrants			$ 61,180	0	0
Proceeds from hedge and warrant terminations			109,881	0	0
Payments for repurchase of warrants			$ 94,292	$ 0	$ 0
2020 Warrants
Debt Instrument [Line Items]
Net proceeds from the convertible notes used to pay for the cost of the convertible note hedge	$ 63,000
Payment of convertible note hedge transactions	$ 124,200
Number of shares covered by the hedge transactions	1.2
Conversion price (in dollars per share)	$ 461.19
Exercise price (in dollars per share)	$ 709.52
Premium of warrant strike price over sales price of common stock	100.00%
Share price (in dollars per share)						$ 354.76
Proceeds from issuance of warrants	$ 61,200
2017 Warrants
Debt Instrument [Line Items]
Net proceeds from the convertible notes used to pay for the cost of the convertible note hedge		$ 18,100
Payment of convertible note hedge transactions		$ 61,500
Number of shares covered by the hedge transactions	0.8	1.4
Conversion price (in dollars per share)		$ 207.63
Exercise price (in dollars per share)		$ 266.39
Premium of warrant strike price over sales price of common stock		70.00%
Share price (in dollars per share)							$ 156.70
Proceeds from issuance of warrants		$ 43,400
Net proceeds from hedge and warrants	$ 15,600