STOCK-BASED COMPENSATION (Details - Stock Options Rollforward) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Feb. 16, 2018	Jan. 02, 2018	Jul. 26, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	May 24, 2017
Weighted Average Exercise Price
Granted (in dollars per share)	$ 378.95	$ 340.25	$ 183.80
Aggregate Intrinsic Value
Share price				$ 219.57			$ 156.70
Weighted average fair value (in dollars per share)				$ 150.55	$ 105.15	$ 40.05
Weighted average assumptions
Fair Value of Options Vested				$ 11,400	$ 4,100	$ 900
Employee Stock Option [Member]
Number of Options
Outstanding at the beginning of the period (in shares)				1,863,739
Granted (in shares)				77,576
Exercised (in shares)				(994,222)
Forfeited (in shares)				(6,560)
Expired (in shares)				0
Outstanding at the end of the period (in shares)				940,533	1,863,739
Options exercisable at the end of the period (in shares)				766,552
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)				$ 30.70
Granted (in dollars per share)				293.18
Exercised (in dollars per share)				16.83
Forfeited (in dollars per share)				301.51
Expired (in dollars per share)				0.00
Outstanding at the end of the period (in dollars per share)				65.12	$ 30.70
Options exercisable at the end of the period (in dollars per share)				$ 28.37
Weighted Average Remaining Contractual Term
Outstanding at the end of the period				5 years 2 months 1 day
Options exercisable at the end of the period				4 years 4 months 24 days
Aggregate Intrinsic Value
Outstanding at the end of the period				$ 150,897
Options exercisable at the end of the period				146,742
Intrinsic value of stock options exercised				268,300	$ 27,700	$ 300
Cash received from stock option exercised				16,700
Actual tax benefit realized				$ 73,300
Weighted average assumptions
Expected Volatility Rate, Minimum				50.00%	51.00%	48.00%
Expected Volatility Rate, Maximum				53.00%	52.00%	53.00%
Risk Free Interest Rate, Minimum				2.33%	1.74%	1.10%
Risk Free Interest Rate, Maximum				3.06%	2.24%	2.18%
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)				37,877
Granted (in shares)				0
Exercised (in shares)				0
Forfeited (in shares)				0
Expired (in shares)				0
Outstanding at the end of the period (in shares)				37,877	37,877
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)				$ 308.90
Granted (in dollars per share)				0.00
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	$ 308.90
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				8 years 11 months 13 days
Options exercisable at the end of the period				0 years
Aggregate Intrinsic Value
Outstanding at the end of the period				$ 0
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)				402,694
Granted (in shares)				44,499
Exercised (in shares)				0
Forfeited (in shares)				0
Expired (in shares)				0
Outstanding at the end of the period (in shares)				447,193	402,694
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)				$ 183.80
Granted (in dollars per share)				351.70
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)				200.51	$ 183.80
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				8 years 7 months 15 days
Options exercisable at the end of the period				0 years
Aggregate Intrinsic Value
Outstanding at the end of the period				$ 14,404
Options exercisable at the end of the period				$ 0
Weighted average fair value (in dollars per share)				$ 296.80	$ 142.45
Weighted average assumptions
Expected Volatility Rate, Minimum				50.00%	50.00%
Expected Volatility Rate, Maximum				50.00%	50.00%
Risk Free Interest Rate, Minimum				2.38%	2.12%
Risk Free Interest Rate, Maximum				2.81%	2.12%
Dividend yield				0.00%	0.00%
Minimum [Member] | Employee Stock Option [Member]
Weighted average assumptions
Expected Term, Simplified Method				P5Y	P5Y	P5Y2M20D
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				P7Y	P7Y6M
Maximum [Member] | Employee Stock Option [Member]
Weighted average assumptions
Expected Term, Simplified Method				P6Y8M15D	P7Y	P6Y4M18D
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				P7Y1M24D	P7Y6M
five months from the grant date | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period				5 months
one year from the grant date | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period				1 year
50% over a period of two years from the grant date | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period				2 years
Award Vesting Rights, Percentage				50.00%
20% over a period of one and a half years from the grant date | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period				1 year 6 months
Award Vesting Rights, Percentage				20.00%
20% over a period of five and a half years from the grant date | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period				5 years 6 months
33% over a period of three years from the grant date | 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 | 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 | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period				3 years
Award Vesting Rights, Percentage				75.00%
four years from the grant date | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period				4 years
25% over a period of four years from the grant date | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period				4 years
Award Vesting Rights, Percentage				25.00%
8% over a period of five months from the grant date | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period				5 months
Award Vesting Rights, Percentage				8.00%
18% each year over a period of five years from the grant date | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period				5 years
Award Vesting Rights, Percentage				18.00%
25% over a period of one year from the grant date | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period				1 year
Award Vesting Rights, Percentage				25.00%
25% over a period of two years from the grant date | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period				2 years
Award Vesting Rights, Percentage				25.00%
50% over a period of three years from the grant date | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period				3 years
Award Vesting Rights, Percentage				50.00%
50% over a period of two years from the grant date | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period				2 years
Award Vesting Rights, Percentage				50.00%
31% over a period of three years from the grant date | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period				3 years
Award Vesting Rights, Percentage				31.00%
19% over a period of four years from the grant date | Employee Stock Option [Member]
Aggregate Intrinsic Value
Vesting period				4 years
Award Vesting Rights, Percentage				19.00%