DEBT (Convertible Note Hedge and Warrant Transactions) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		12 Months Ended
	May 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	May 24, 2017
Debt Disclosure [Abstract]
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	$ 0	$ 0	$ 61,500
Number of shares covered by the hedge transactions	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)		$ 303.44			$ 156.70
Proceeds from the sale of warrants	$ 43,400	$ 0	$ 0	$ 43,410