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BORROWINGS - Long term narrative and interest expense (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Oct. 11, 2019
USD ($)
Jul. 15, 2019
USD ($)
Jun. 28, 2019
JPY (¥)
Jun. 28, 2019
USD ($)
Jan. 31, 2019
JPY (¥)
Jan. 25, 2019
USD ($)
Oct. 31, 2018
USD ($)
Sep. 14, 2018
USD ($)
Apr. 05, 2018
USD ($)
Mar. 30, 2018
USD ($)
Mar. 26, 2018
USD ($)
BORROWINGS                            
Floating interest rate (as a percent) 5.43% 3.13%                        
Interest expense                            
Interest capitalized - project assets $ 10,794 $ 15,462 $ 13,274                      
Interest capitalized - property, plant, and equipment 2,620 1,182 1,010                      
Interest expense 81,326 106,032 117,971                      
Total interest incurred 94,740 $ 122,676 $ 132,255                      
Credit facility                            
BORROWINGS                            
Maximum borrowing capacity $ 2,331,226                          
Unsecured                            
BORROWINGS                            
Floating interest rate (as a percent) 4.86% 4.58%                        
Secured by project assets and solar power systems                            
BORROWINGS                            
Floating interest rate (as a percent) 3.65% 4.61%                        
Finance agreement                            
BORROWINGS                            
Maximum borrowing capacity | ¥           ¥ 5,989                
Outstanding balance             $ 1,503              
Bank borrowings | Subsidiary                            
BORROWINGS                            
Maximum borrowing capacity                     $ 123,708      
Outstanding balance $ 123,708                          
Bank borrowings | Secured by Inventory and accounts receivable                            
BORROWINGS                            
Maximum borrowing capacity | ¥               ¥ 8,476            
Outstanding balance 8,476                          
Bank borrowings | Unsecured                            
BORROWINGS                            
Maximum borrowing capacity                           $ 49,290
Outstanding balance 11,881                          
Bank borrowings | Secured by project assets and solar power systems                            
BORROWINGS                            
Maximum borrowing capacity                         $ 50,000  
Outstanding balance 50,000                          
Bank borrowings | Secured by project assets and solar power systems | Subsidiary                            
BORROWINGS                            
Maximum borrowing capacity                       $ 43,003    
Outstanding balance 34,188                          
Borrowings from non-banking institutions                            
BORROWINGS                            
Maximum borrowing capacity                   $ 93,975        
Outstanding balance 93,975                          
Borrowings from non-banking institutions | Subsidiary                            
BORROWINGS                            
Maximum borrowing capacity         $ 110,000                  
Outstanding balance 91,095                          
Borrowings from non-banking institutions | Secured by prepaid land use rights and guaranteed by Chinese Subsidiary                            
BORROWINGS                            
Maximum borrowing capacity                 $ 129,010          
Outstanding balance $ 40,136                          
Borrowings from non-banking institutions | Finance agreement                            
BORROWINGS                            
Maximum borrowing capacity       $ 60,000                    
Outstanding balance       $ 60,000