STOCK-BASED COMPENSATION (Details - Stock Options Rollforward) (USD $)	3 Months Ended
	Mar. 31, 2014
STOCK-BASED COMPENSATION
Share Price	$ 31.04
Stock options
Stock options, Shares
Outstanding at the beginning of the period (in shares)	1,038,999
Granted (in shares)	42,757
Exercised (in shares)	(2,692)
Expired (in shares)	(10)
Outstanding at the end of the period (in shares)	1,079,054
Options exercisable at the end of the period (in shares)	935,005
Stock options, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 8.98
Granted (in dollars per share)	$ 33.59
Exercised (in dollars per share)	$ 11.44
Expired (in dollars per share)	$ 0.47
Outstanding at the end of the period (in dollars per share)	$ 9.95
Options exercisable at the end of the period (in dollars per share)	$ 9.23
Stock options, Weighted Average Remaining Contractual Term
Outstanding at the end of the period	4 years 8 months 27 days
Options exercisable at the end of the period	4 years 2 months 16 days
Stock options, Aggregate Intrinsic Value
Outstanding at the end of the period	$ 22,865,000
Options exercisable at the end of the period	20,394,000
Stock options, Grant Date Fair Value Valuation
Grant date fair value	$ 17.13
Vesting period	3 years
Expected term	6 years
Expected dividends	$ 0
Expected dividend rate	0.00%
Expected volatility	54.00%
Risk-free interest rate	1.85%