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Income Tax (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
PRC [Member]        
Income Tax (Textual)        
PRC statutory rate 25.00% 25.00% 25.00% 25.00%
Income tax rate for dividends distribution     10.00%  
HONG KONG        
Income Tax (Textual)        
PRC statutory rate     16.50%  
Maximum [Member]        
Income Tax (Textual)        
Effective income tax reduction, percent     15.00%  
Minimum [Member]        
Income Tax (Textual)        
Effective income tax reduction, percent     9.00%  
Xizang (Tibet) [Member]        
Income Tax (Textual)        
PRC statutory rate     15.00%  
Non-U.S. subsidiaries [Member]        
Income Tax (Textual)        
U.S. deferred income taxes     $ 104,300  
Income tax, description     The statutory U.S. federal corporate income tax rate from 35% to 21% for taxable years beginning after December 31, 2017