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8. NOTES PAYABLE, REVOLVING CREDIT FACILITY AND CAPITAL LEASES (Details - Schedule of debt) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Discounts on term loan and notes	$ (18,470)	$ (16,783)
Promissory notes payable	592	980
Equipment notes payable	195	341
Obligations under capital leases	6,538	7,256
Total notes payable, line of credit and capital lease obligations	609,127	638,732
Less: current portion	(34,090)	(26,557)
Total notes payable, line of credit and capital lease obligations, long-term	575,037	612,175
First Lien Term Loan [Member]
Term loans	620,272	478,938
Second Lien Term Loans [Member]
Term loans	$ 0	$ 168,000

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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