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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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