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5. REVOLVING CREDIT FACILITY, NOTES PAYABLE AND CAPITAL LEASES (Details Narrative) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Total line of credit available $ 117,500  
Discounts on term loans 16,791 $ 18,470
Deferred financing costs, net 1,600 1,900
Line Of Credit [Member]    
Deferred financing costs, net 1,600  
Revolving Credit Facility [Member]    
Total credit facilities outstanding 0  
Total line of credit available 109,300  
Letter of credit reserve $ 8,200  
Effective interest rate 7.75%  
Debt maturity date Jul. 01, 2021  
First Lien Term Loans [Member]    
Term loans net $ 586,900  
Discounts on term loans $ 16,800  
Amendment No. 5 to Credit Agreement [Member]    
Deferred financing costs, net   350
Proceeds from term loans   170,000
Debt issuance costs   4,700
Debt discount   4,100
Amortization of deferred issuance costs   235
Amendment No. 4 to Credit Agreement [Member]    
Deferred financing costs, net   $ 543