INCOME TAXES (Details - Unrecognized Tax Benefits) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Unrecognized Tax Benefits [Roll Forward]
Unrecognized tax benefits beginning balance	$ 1,843	$ 7,664	$ 5,749
Increase for current year tax positions	12,620	368	0
Increase for prior year tax positions			1,954
Decrease for prior period tax positions	(34)	(6,115)
Expiration of the statute of limitation for assessment of taxes	(66)	(74)	(39)
Unrecognized tax benefits ending balance	14,363	1,843	7,664
Unrecognized tax benefits that would favorably affect the annual effective tax rate if recognized in future periods	14,000	1,000
Interest and penalties on income taxes recognized	72		83
Interest and penalties on income taxes reversed		416
Interest and penalties accrued on income taxes	$ 205	$ 133	$ 549