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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Investment in Joint Ventures) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 37,973 |  |  |  | $ 52,435 | $ 37,973 | $ 52,435 |
Equity contributions in existing and purchase of interest in joint ventures |  |  |  |  |  |  |  |  | 103 | 2,000 |
Equity in earnings in these joint ventures | $ 2,278 | $ 1,955 | $ 2,244 | $ 1,873 | $ 1,830 | $ 2,822 | $ 3,748 | $ 2,977 | 8,350 | 11,377 | $ 13,554
Sale of ownership interest |  |  |  |  |  |  |  |  | (134) |  |
Dissolution of GSRN |  |  |  |  |  |  |  |  | (1,428) |  |
Nulogix return of capital |  |  |  |  |  |  |  |  | (792) | 0 | 0
Equity interest acquiree remeasurement loss |  |  |  |  |  |  |  |  | (1,004) | (2,993) |
Distribution of earnings |  |  |  |  |  |  |  |  | (8,598) | (24,846) |
Ending balance | $ 34,470 |  |  |  | $ 37,973 |  |  |  | $ 34,470 | $ 37,973 | $ 52,435

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