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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Investment in Joint Ventures) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Roll Forward] |  |  |
Beginning balance | $ 34,470 | $ 37,973 |
Equity contributions in existing and purchase of interest in joint ventures | 1,635 | 103 |
Equity in earnings in these joint ventures | 7,945 | 8,350 | $ 11,377
Sale of ownership interest |  | (134) |
Dissolution of GSRN |  | (1,428) |
Nulogix return of capital | 0 | (792) | 0
Equity interest acquiree remeasurement loss |  | (1,004) |
Distribution of earnings | (9,522) | (8,598) |
Ending balance | $ 34,528 | $ 34,470 | $ 37,973

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