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NOTES PAYABLE, REVOLVING CREDIT FACILITY AND CAPITAL LEASES (Details - Narrative) - USD ($)
12 Months Ended
Apr. 18, 2019
Aug. 31, 2018
Jul. 01, 2016
Dec. 31, 2019
Dec. 31, 2018
Aug. 22, 2017
Debt Instrument [Line Items]            
Deferred financing costs, net of accumulated amortization       $ 1,600,000 $ 1,400,000  
Restated Agreement            
Debt Instrument [Line Items]            
Credit facilities, increase (decrease)   $ 90,000,000.0        
Barclays            
Debt Instrument [Line Items]            
Net of accumulated amortization       1,600,000    
Term Loan            
Debt Instrument [Line Items]            
Total carrying value       692,120,000    
Debt, unamortized discount       13,579,000    
Face value       705,699,000    
Term Loan | First Lien Term Loans            
Debt Instrument [Line Items]            
Total carrying value       636,245,000    
Debt, unamortized discount       13,579,000    
Face value       649,824,000    
Term Loan | First Lien Term Loans | Maximum            
Debt Instrument [Line Items]            
Face value       100,000,000.0    
Term Loan | Restated Agreement            
Debt Instrument [Line Items]            
Credit facilities available   60,000,000.0        
Total carrying value       55,875,000    
Debt, unamortized discount       0    
Face value       55,875,000    
Term Loan | Barclays | First Lien Term Loans            
Debt Instrument [Line Items]            
Periodic payment, principal       9,700,000    
Term Loan | SunTrust            
Debt Instrument [Line Items]            
Debt periodic payment         $ 750,000  
Debt periodic payment, percent of total amount         5.00%  
Debt periodic payment, amortization increase         $ 375,000  
Medium-term Notes | Amendment No. 6 First Lien Credit Agreement            
Debt Instrument [Line Items]            
Total credit facilities outstanding           $ 100,000,000.0
Amendment No. 7 First Lien Credit Agreement            
Debt Instrument [Line Items]            
Issuance costs $ 4,400,000          
Debt instrument, unamortized discount, current 2,100,000          
Deferred financing costs, net of accumulated amortization 683,000          
Amortization of deferred charges 1,600,000          
Revolving Credit Facility            
Debt Instrument [Line Items]            
Letters of credit outstanding, amount       $ 5,900,000    
Effective interest rate       7.25%    
Revolving Credit Facility | Barclays            
Debt Instrument [Line Items]            
Credit facility, borrowings available       $ 131,700,000    
Revolving Credit Facility | Line of Credit | First Lien Credit Agreement | Eurodollar | 3.50x but ≤ 4.00x            
Debt Instrument [Line Items]            
Basis spread on variable rate     3.50%      
Revolving Credit Facility | Line of Credit | First Lien Credit Agreement | Base Rate | 3.50x but ≤ 4.00x            
Debt Instrument [Line Items]            
Basis spread on variable rate     2.50%      
Revolving Credit Facility | Line of Credit | Amendment No. 6 First Lien Credit Agreement            
Debt Instrument [Line Items]            
Line of credit facility, increase borrowing capacity $ 20,000,000.0          
Revolving Credit Facility | Line of Credit | Amendment No. 6 First Lien Credit Agreement | Eurodollar            
Debt Instrument [Line Items]            
Effective interest rate       2.01%    
Revolving Credit Facility | Line of Credit | Amendment No. 6 First Lien Credit Agreement | Eurodollar | 3.50x but ≤ 4.00x            
Debt Instrument [Line Items]            
Basis spread on variable rate       3.50%    
Revolving Credit Facility | Line of Credit | Amendment No. 6 First Lien Credit Agreement | Base Rate            
Debt Instrument [Line Items]            
Effective interest rate       4.75%    
Revolving Credit Facility | Line of Credit | Amendment No. 6 First Lien Credit Agreement | Base Rate | 3.50x but ≤ 4.00x            
Debt Instrument [Line Items]            
Basis spread on variable rate       2.50%    
Revolving Credit Facility | Line of Credit | Barclays | First Lien Credit Agreement            
Debt Instrument [Line Items]            
Credit facilities available       $ 137,500,000    
Total credit facilities outstanding       0    
Revolving Credit Facility | Line of Credit | SunTrust            
Debt Instrument [Line Items]            
Credit facilities available       30,000,000.0    
Revolving Credit Facility | Line of Credit | SunTrust | First Lien Credit Agreement            
Debt Instrument [Line Items]            
Total credit facilities outstanding       $ 0    
Revolving Credit Facility | Line of Credit | SunTrust | Restated Agreement            
Debt Instrument [Line Items]            
Credit facilities available   $ 30,000,000.0        
Revolving Credit Facility | Letter of Credit | Barclays            
Debt Instrument [Line Items]            
Commitment fee percentage       0.25%    
Unused capacity, commitment fee percentage       0.50%