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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Investment in Joint Ventures) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 52,435 |  |  |  | $ 43,509 | $ 52,435 | $ 43,509 |
Equity contributions in existing and purchase of interest in joint ventures |  |  |  |  |  |  |  |  | 2,000 | 4,062 |
Equity in earnings in these joint ventures | $ 1,830 | $ 2,822 | $ 3,748 | $ 2,977 | $ 5,182 | $ 3,450 | $ 2,994 | $ 1,928 | 11,377 | 13,554 | $ 9,767
Disposition of equity method interest upon acquisition of control in NJIN |  |  |  |  |  |  |  |  | (2,993) |  |
Distribution of earnings |  |  |  |  |  |  |  |  | (24,846) | (8,690) | (2,926)
Ending balance | $ 37,973 |  |  |  | $ 52,435 |  |  |  | $ 37,973 | $ 52,435 | $ 43,509

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