STOCK-BASED COMPENSATION (Details - Stock Options Rollforward)	3 Months Ended
	Mar. 31, 2016 USD ($) $ / shares shares
STOCK-BASED COMPENSATION
Share Price	$ 97.78
Stock options, Grant Date Fair Value Valuation
Grant date fair value	$ 35.08
Aggregate stock options
Stock options, Shares
Outstanding at the beginning of the period (in shares) | shares	1,918,182
Granted (in shares) | shares	53,745
Exercised (in shares) | shares	(1,244)
Forfeited (in shares) | shares	(2,653)
Expired (in shares) | shares	0
Outstanding at the end of the period (in shares) | shares	1,968,030
Options exercisable at the end of the period (in shares) | shares	947,851
Stock options, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 18.85
Granted (in dollars per share)	70.77
Exercised (in dollars per share)	33.59
Forfeited (in dollars per share)	73.42
Expired (in dollars per share)	0.00
Outstanding at the end of the period (in dollars per share)	20.18
Options exercisable at the end of the period (in dollars per share)	$ 8.98
Stock options, Weighted Average Remaining Contractual Term
Outstanding at the end of the period	5 years 9 months 15 days
Options exercisable at the end of the period	3 years 3 months 8 days
Stock options, Aggregate Intrinsic Value
Outstanding at the end of the period | $	$ 152,870,000
Options exercisable at the end of the period | $	84,167,000
Stock options, Grant Date Fair Value Valuation
Expected dividends | $	$ 0
Expected dividend rate	0.00%
Expected volatility, minimum	48.00%
Expected volatility, maximum	52.00%
Risk-free interest rate, minimum	1.37%
Risk-free interest rate, maximum	1.90%
Stock options
Stock options, Grant Date Fair Value Valuation
Vesting period	3 years
Minimum | Aggregate stock options
Stock options, Grant Date Fair Value Valuation
Expected term	P6Y0M
Minimum | 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 | Stock options
Stock options, Grant Date Fair Value Valuation
Grant date fair value