STOCK-BASED COMPENSATION (Details - RSA & RSU Rollforwards)	6 Months Ended
	Jun. 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	64,666
Vested (in shares) | shares	(123,182)
Forfeited (in shares) | shares	(12,695)
Nonvested at the end of the period (in shares) | shares	166,166
Nonvested RSUs, Restricted Stock and Restrick 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	72.32
Vested (in dollars per share) | $ / shares	29.09
Forfeited (in dollars per share) | $ / shares	55.26
Nonvested at the end of the period (in dollars per share) | $ / shares	$ 63.98
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 Restrick 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