STOCK-BASED COMPENSATION (Details - Stock Options Rollforward) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jul. 26, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	May 24, 2017
Weighted Average Exercise Price
Granted (in dollars per share)	$ 183.80
Aggregate Intrinsic Value
Share price		$ 340.45			$ 156.70
Weighted average fair value (in dollars per share)		$ 105.15	$ 40.05	$ 27.60
Weighted average assumptions
Fair Value of Options Vested		$ 4,100	$ 900	$ 800
Employee Stock Option [Member]
Number of Options
Outstanding at the beginning of the period (in shares)		1,991,802
Granted (in shares)		112,059
Exercised (in shares)		(219,094)
Forfeited (in shares)		(21,028)
Expired (in shares)		0
Outstanding at the end of the period (in shares)		1,863,739	1,991,802
Options exercisable at the end of the period (in shares)		1,036,757
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)		$ 21.23
Granted (in dollars per share)		207.79
Exercised (in dollars per share)		31.29
Forfeited (in dollars per share)		70.90
Expired (in dollars per share)		0.00
Outstanding at the end of the period (in dollars per share)		30.70	$ 21.23
Options exercisable at the end of the period (in dollars per share)		$ 11.56
Weighted Average Remaining Contractual Term
Outstanding at the end of the period		4 years 5 months 15 days
Options exercisable at the end of the period		2 years 4 months 3 days
Aggregate Intrinsic Value
Outstanding at the end of the period		$ 577,295
Options exercisable at the end of the period		340,976
Intrinsic value of stock options exercised		27,700	$ 300	$ 5,900
Cash received from stock option exercised		6,900
Actual tax benefit realized		$ 11,300
Weighted average assumptions
Expected Volatility Rate, Minimum		51.00%	48.00%	38.00%
Expected Volatility Rate, Maximum		52.00%	53.00%	48.00%
Risk Free Interest Rate, Minimum		1.74%	1.10%	1.65%
Risk Free Interest Rate, Maximum		2.24%	2.18%	2.01%
Dividend yield		0.00%	0.00%	0.00%
Employee Stock Option 2 [Member]
Number of Options
Outstanding at the beginning of the period (in shares)		0
Granted (in shares)		37,877
Exercised (in shares)		0
Forfeited (in shares)		0
Expired (in shares)		0
Outstanding at the end of the period (in shares)		37,877	0
Options exercisable at the end of the period (in shares)		0
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)		$ 0.00
Granted (in dollars per share)		308.90
Exercised (in dollars per share)		0.00
Forfeited (in dollars per share)		0.00
Expired (in dollars per share)		0.00
Outstanding at the end of the period (in dollars per share)		308.90	$ 0.00
Options exercisable at the end of the period (in dollars per share)		$ 0.00
Weighted Average Remaining Contractual Term
Outstanding at the end of the period		9 years 11 months 11 days
Options exercisable at the end of the period		0 years
Aggregate Intrinsic Value
Outstanding at the end of the period		$ 1,195
Options exercisable at the end of the period		$ 0
Weighted average fair value (in dollars per share)		$ 152.45
Weighted average assumptions
Expected Volatility Rate, Minimum		51.00%
Expected Volatility Rate, Maximum		51.00%
Risk Free Interest Rate, Minimum		2.16%
Risk Free Interest Rate, Maximum		2.23%
Dividend yield		0.00%
Performance Options [Member]
Number of Options
Outstanding at the beginning of the period (in shares)		0
Granted (in shares)		402,694
Exercised (in shares)		0
Forfeited (in shares)		0
Expired (in shares)		0
Outstanding at the end of the period (in shares)		402,694	0
Options exercisable at the end of the period (in shares)		0
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)		$ 0.00
Granted (in dollars per share)		183.80
Exercised (in dollars per share)		0.00
Forfeited (in dollars per share)		0.00
Expired (in dollars per share)		0.00
Outstanding at the end of the period (in dollars per share)		183.80	$ 0.00
Options exercisable at the end of the period (in dollars per share)		$ 0.00
Weighted Average Remaining Contractual Term
Outstanding at the end of the period		9 years 6 months 25 days
Options exercisable at the end of the period		0 years
Aggregate Intrinsic Value
Outstanding at the end of the period		$ 63,082
Options exercisable at the end of the period		$ 0
Weighted average fair value (in dollars per share)		$ 142.45
Weighted average assumptions
Expected Volatility Rate, Minimum		50.00%
Expected Volatility Rate, Maximum		50.00%
Risk Free Interest Rate, Minimum		2.12%
Risk Free Interest Rate, Maximum		2.12%
Dividend yield		0.00%
Minimum [Member] | Employee Stock Option [Member]
Weighted average assumptions
Expected Term, Simplified Method		P5Y	P5Y2M20D	P5Y2M15D
Minimum [Member] | Employee Stock Option 2 [Member]
Aggregate Intrinsic Value
Vesting period		1 year 2 months
Weighted average assumptions
Expected Term, Simplified Method		P5Y6M
Minimum [Member] | Performance Options [Member]
Weighted average assumptions
Expected Term, Simplified Method		P7Y6M
Maximum [Member] | Employee Stock Option [Member]
Weighted average assumptions
Expected Term, Simplified Method		P7Y	P6Y4M18D	P6Y2M23D
Maximum [Member] | Employee Stock Option 2 [Member]
Aggregate Intrinsic Value
Vesting period		2 years 2 months
Weighted average assumptions
Expected Term, Simplified Method		P6Y
Maximum [Member] | Performance Options [Member]
Weighted average assumptions
Expected Term, Simplified Method		P7Y6M
five months from the grant date [Member] | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period		5 months
one year from the grant date [Member] | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period		1 year
50% over a period of two years from the grant date [Member] | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period		2 years
Award Vesting Rights, Percentage		50.00%
25% over a period of 1.67 years from the grant date [Member] | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period		1 year 8 months
Award Vesting Rights, Percentage		25.00%
75% over a period of 2.67 years from the grant date [Member] | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period		2 years 8 months
Award Vesting Rights, Percentage		75.00%
33% over a period of three years from the grant date [Member] | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period		3 years
Award Vesting Rights, Percentage		33.00%
25% over a period of two years from the grant date [Member] | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period		2 years
Award Vesting Rights, Percentage		25.00%
75% over a period of three years from the grant date [Member] | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period		3 years
Award Vesting Rights, Percentage		75.00%
four years from the grant date [Member] | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period		4 years
25% over a period of four years from the grant date [Member] | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period		4 years
Award Vesting Rights, Percentage		25.00%