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6. INVESTMENT IN JOINT VENTURES (Details-Joint ventures) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Equity Method Investments and Joint Ventures [Abstract]        
Beginning balance     $ 33,584  
Equity earnings in these joint ventures $ 3,274 $ 3,207 5,553 $ 4,309
Distribution of earnings     (2,098) (6,195)
Equity contributions in existing joint ventures     994 $ 0
Ending balance $ 39,483   $ 39,483