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SUMMARY OF ACCOUNTING POLICIES (Details - Investment in Joint Ventures) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Accounting Policies [Abstract] |  |  |  |
Beginning balance |  |  | $ 37,973 |
Equity in earnings in these joint ventures | $ 2,244 | $ 3,748 | 4,117 | $ 6,725
Distribution of earnings |  |  | (3,438) | $ (7,083)
Sale of ownership interest |  |  | (134) |
Equity contributions in existing joint ventures |  |  | 103 |
Ending balance | $ 38,621 |  | $ 38,621 |

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