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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Federal statutory income tax |  | $ (8,931) | $ 6,506 | $ 9,186
State income taxes, net |  | (3,551) | (1,832) | (14,884)
Excess tax deductions on non-cash compensation |  | (2,033) | (13,971) | (59,601)
Impact of the Coronavirus Aid, Relief, and Economic Security Act |  | (6,104) | 0 | 0
Research and experimentation tax credit |  | (3,800) | (5,794) | (2,523)
Impact of certain state legislation, net |  | 0 | 3,932 | 0
Nondeductible executive compensation |  | 1,778 | 988 | 163
Change in (release of) valuation allowance |  | 2,100 | 954 | (12)
Uncertain tax positions |  | 458 | 922 | 289
Nondeductible meals & entertainment |  | 99 | 428 | 310
Impact of Tax Cuts and Jobs Act |  | 0 | 0 | 270
Other, net |  | 23 | (612) | 1,227
Income tax benefit |  | $ (19,961) | $ (8,479) | (65,575)
Provisional estimate for remeasurement of deferred tax assets and liabilities from Tax Cuts and Jobs Act | $ 9,100 |  |  | $ 9,100

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- Definition Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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