INCOME TAXES (Details - Income Tax Reconciliation when Applying the Statutory Federal Tax Rate) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of income tax provision to amounts computed by statutory federal income tax rate to income (loss) from continuing operations before income taxes
Income tax expense at the federal statutory rate of 35%		$ 8,998	$ 18,051	$ 9,920
State income taxes, net of effect of federal tax benefit		(268)	4,038	1,480
Impact of Tax Cuts and Jobs Act	$ 9,100	9,062	0	0
Excess Tax Deductions on Non-Cash Compensation		(11,134)	0	0
Change in (release of) valuation allowance		593	(416)	(34,409)
Research and experimentation tax credit		(1,318)	(2,574)	0
Other, net		358	1,267	36
Income tax expense (benefit)		$ 6,291	$ 20,366	$ (22,973)
Federal Statutory Income Tax Rate (as a percent)		35.00%	35.00%	35.00%