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INCOME TAXES (Details - Narrative) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred tax assets, tax benefit may not be realized | $ 74,400 |  |  |
Deferred tax liabilities goodwill | 19,780 | $ 17,568 |  |
Unrecognized tax benefits | 4,629 | $ 3,615 | $ 3,861 | $ 94
Unrecognized tax benefits, tax impact if recognized | 3,700 |  |  |
Unrecognized tax benefits, income tax penalties and interest accrued during period | 280 |  |  |
Unrecognized tax benefits, income tax penalties and interest accrued | $ 300 |  |  |
U.S. federal corporate tax rate | 21.00% |  |  |
Tax cuts and jobs act, change in tax rate, income tax expense (benefit) | $ 13,600 |  |  |
Domestic Tax Authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforward | 193,700 |  |  |
Operating loss carryforwards, subject to expiration | $ 187,700 |  |  |
Operating loss ending expiration date | Dec. 31, 2037 |  |  |
State and Local Jurisdiction |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforward | $ 101,200 |  |  |
Operating loss ending expiration date | Dec. 31, 2038 |  |  |
Tax Year 2018 | Domestic Tax Authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforward | $ 6,000 |  |  |
Raven Holdings | Domestic Tax Authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards, subject to expiration | $ 23,500 |  |  |

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