STOCK-BASED COMPENSATION (Details - RSA & RSU Rollforwards)	3 Months Ended
	Mar. 31, 2016 $ / shares shares
RSUs
Nonvested RSUs and Restricted Stock, Number of Shares
Nonvested at the beginning of the period (in shares) | shares	237,377
Granted (in shares) | shares	52,110
Vested (in shares) | shares	(110,477)
Forfeited (in shares) | shares	(5,692)
Nonvested at the end of the period (in shares) | shares	173,318
Nonvested RSUs and Restricted Stock, Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share) | $ / shares	$ 43.13
Granted (in dollars per share) | $ / shares	70.54
Vested (in dollars per share) | $ / shares	27.81
Forfeited (in dollars per share) | $ / shares	57.05
Nonvested at the end of the period (in dollars per share) | $ / shares	$ 60.69
Restricted stock
Nonvested RSUs and Restricted Stock, Number of Shares
Nonvested at the beginning of the period (in shares) | shares	68,762
Granted (in shares) | shares	0
Vested (in shares) | shares	(20,834)
Nonvested at the end of the period (in shares) | shares	47,928
Nonvested RSUs and Restricted Stock, Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share) | $ / shares	$ 23.60
Granted (in dollars per share) | $ / shares	0.00
Vested (in dollars per share) | $ / shares	17.49
Nonvested at the end of the period (in dollars per share) | $ / shares	$ 26.25