DEBT (Details - Convertible Note Hedge and Warrant Transactions) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		9 Months Ended
	May 31, 2017	Sep. 30, 2018	Sep. 30, 2017	May 24, 2017
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	$ 0	$ 61,500
Number of shares covered by the hedge transactions	1.4
Initial conversion price per share	$ 207.63
Strike price of warrants sold	$ 266.39
Premium of warrant strike price over sales price of common stock	70.00%
Share price		$ 230.10		$ 156.70
Proceeds from the sale of warrants	$ 43,410	$ 0	$ 43,410