STOCK-BASED COMPENSATION (Details - Stock Options Rollforward)	6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares
STOCK-BASED COMPENSATION
Share Price	$ 88.33
Stock options, Grant Date Fair Value Valuation
Grant date fair value	$ 37.69
Aggregate stock options
Stock options, Shares
Outstanding at the beginning of the period (in shares) | shares	1,918,182
Granted (in shares) | shares	73,159
Exercised (in shares) | shares	(1,244)
Forfeited (in shares) | shares	(4,922)
Expired (in shares) | shares	0
Outstanding at the end of the period (in shares) | shares	1,985,175
Options exercisable at the end of the period (in shares) | shares	970,625
Stock options, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 18.85
Granted (in dollars per share)	75.07
Exercised (in dollars per share)	33.59
Forfeited (in dollars per share)	73.66
Expired (in dollars per share)	0.00
Outstanding at the end of the period (in dollars per share)	20.77
Options exercisable at the end of the period (in dollars per share)	$ 9.45
Stock options, Weighted Average Remaining Contractual Term
Outstanding at the end of the period	5 years 7 months 5 days
Options exercisable at the end of the period	3 years 1 month 18 days
Stock options, Aggregate Intrinsic Value
Outstanding at the end of the period | $	$ 134,344,000
Options exercisable at the end of the period | $	76,572,000
Stock options, Grant Date Fair Value Valuation
Expected dividends | $	$ 0
Expected dividend rate	0.00%
Expected volatility, minimum	48.00%
Expected volatility, maximum	53.00%
Risk-free interest rate, minimum	1.24%
Risk-free interest rate, maximum	1.90%
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	P5Y9M
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	P6Y4M15D
Maximum | Employee stock options
Stock options, Grant Date Fair Value Valuation
Grant date fair value
Tranche 1 | Employee stock options
Stock options, Grant Date Fair Value Valuation
Vesting period	2 years
Award vesting rights, percentage	25.00%
Tranche 2 | Employee stock options
Stock options, Grant Date Fair Value Valuation
Vesting period	3 years
Award vesting rights, percentage	75.00%