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INCOME TAXES (Details - Narrative) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]        
Tax cuts and jobs act, change in tax rate, income tax expense (benefit)   $ 13,600    
Deferred tax assets, tax benefit may not be realized $ 193,200      
Deferred tax liabilities goodwill 24,637 19,780    
Unrecognized tax benefits 4,320 $ 4,629 $ 3,615 $ 3,861
Unrecognized tax benefits, tax impact if recognized 3,500      
Unrecognized tax benefits, income tax penalties and interest accrued during period 30      
Unrecognized tax benefits, income tax penalties and interest accrued 300      
Domestic Tax Authority        
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforward 136,200      
Operating loss carryforwards, subject to expiration $ 124,700      
Operating loss ending expiration date Dec. 31, 2037      
State and Local Jurisdiction        
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforward $ 98,600      
Operating loss ending expiration date Dec. 31, 2039      
Tax Year 2018 | Domestic Tax Authority        
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforward $ 11,500      
Raven Holdings | Domestic Tax Authority        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards, subject to expiration $ 24,600