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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Revenue Recognition) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
SUMMARY OF PRINCIPAL ACCOUNTING POLICIES      
Revenue from polysilicon sales $ 2,307,695 $ 4,608,350 $ 1,678,793
Domestic sales      
SUMMARY OF PRINCIPAL ACCOUNTING POLICIES      
Revenue from polysilicon sales 2,279,756 $ 4,608,350 $ 1,678,793
Export sales      
SUMMARY OF PRINCIPAL ACCOUNTING POLICIES      
Revenue from polysilicon sales $ 27,939