STOCK-BASED COMPENSATION (Details - RSA & RSU Rollforwards)	9 Months Ended
	Sep. 30, 2016 $ / shares shares
RSUs
Nonvested RSUs, Restricted Stock and Restricted Stock Units with Performance Conditions, Number of Shares
Nonvested at the beginning of the period (in shares) | shares	237,377
Granted (in shares) | shares	68,884
Vested (in shares) | shares	(133,255)
Forfeited (in shares) | shares	(17,452)
Nonvested at the end of the period (in shares) | shares	155,554
Nonvested RSUs, Restricted Stock and Restricted Stock Units with Performance Conditions, 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	73.81
Vested (in dollars per share) | $ / shares	33.17
Forfeited (in dollars per share) | $ / shares	57.12
Nonvested at the end of the period (in dollars per share) | $ / shares	$ 63.68
Restricted stock
Nonvested RSUs, Restricted Stock and Restricted Stock Units with Performance Conditions, Number of Shares
Nonvested at the beginning of the period (in shares) | shares	68,762
Granted (in shares) | shares	0
Vested (in shares) | shares	(35,297)
Nonvested at the end of the period (in shares) | shares	33,465
Nonvested RSUs, Restricted Stock and Restricted Stock Units with Performance Conditions, 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	20.62
Nonvested at the end of the period (in dollars per share) | $ / shares	$ 26.73