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5. INVESTMENT IN JOINT VENTURES (Details-Joint ventures) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Equity Method Investments and Joint Ventures [Abstract]    
Beginning balance $ 28,949  
Equity contributions in existing joint ventures 900  
Equity earnings in these joint ventures 2,713 2,864
Distribution of earnings (5,041) (3,971)
Ending balance $ 27,521