STOCK-BASED COMPENSATION (Details - Stock Options Rollforward) - USD ($)	6 Months Ended
	Jun. 30, 2017	May 24, 2017
STOCK-BASED COMPENSATION
Share price	$ 172.20	$ 156.70
Stock options, Grant Date Fair Value Valuation
Grant date fair value	$ 77.53
Aggregate stock options
Stock options, Shares
Outstanding at the beginning of the period (in shares)	1,991,802
Granted (in shares)	26,229
Exercised (in shares)	(172,025)
Forfeited (in shares)	(20,001)
Expired (in shares)	0
Outstanding at the end of the period (in shares)	1,826,005
Options exercisable at the end of the period (in shares)	1,077,526
Stock options, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 21.23
Granted (in dollars per share)	156.14
Exercised (in dollars per share)	30.53
Forfeited (in dollars per share)	71.04
Expired (in dollars per share)	0.00
Outstanding at the end of the period (in dollars per share)	21.74
Options exercisable at the end of the period (in dollars per share)	$ 11.99
Stock options, Weighted Average Remaining Contractual Term
Outstanding at the end of the period	4 years 9 months 5 days
Options exercisable at the end of the period	2 years 11 months 22 days
Stock options, Aggregate Intrinsic Value
Outstanding at the end of the period	$ 274,738,000
Options exercisable at the end of the period	172,635,000
Stock options, Grant Date Fair Value Valuation
Expected dividends	$ 0
Expected dividend rate	0.00%
Expected volatility, minimum	51.00%
Expected volatility, maximum	52.00%
Risk-free interest rate, minimum	1.74%
Risk-free interest rate, maximum	2.17%
Employee stock options
Stock options, Grant Date Fair Value Valuation
Vesting period	3 years
Director stock options
Stock options, Grant Date Fair Value Valuation
Vesting period	2 years
Minimum | Aggregate stock options
Stock options, Grant Date Fair Value Valuation
Expected term	P5Y0M0D
Minimum | Employee stock options
Stock options, Grant Date Fair Value Valuation
Grant date fair value
Maximum | Aggregate stock options
Stock options, Grant Date Fair Value Valuation
Expected term	P6Y0M0D
Maximum | Employee stock options
Stock options, Grant Date Fair Value Valuation
Grant date fair value