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Income Tax (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Minimum [Member]    
Income Tax (Textual)    
Effective income tax reduction, percent 9.00%  
Maximum [Member]    
Income Tax (Textual)    
Effective income tax reduction, percent 15.00%  
Xizang (Tibet) [Member]    
Income Tax (Textual)    
PRC statutory rate 15.00%  
Subsidiaries [Member]    
Income Tax (Textual)    
U.S. deferred income taxes $ 105,900  
Income tax, description The statutory U.S. federal corporate income tax rate from 35% to 21% for taxable years beginning after December 31, 2017  
PRC [Member]    
Income Tax (Textual)    
PRC statutory rate 25.00% 25.00%
Income tax rate for dividends distribution 10.00%  
HONG KONG    
Income Tax (Textual)    
PRC statutory rate 16.50%