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FAIR VALUE MEASUREMENTS AND INVESTMENTS - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2019
Jan. 31, 2021
Dec. 31, 2020
Fair value measurements            
Payment for investment   $ 5,242 $ 2,768      
(Gain) loss on equity investments   (1,793) $ 1,412      
Privately Held Investment            
Fair value measurements            
Payments to acquire equity method investment $ 2,800          
Ownership percentage 24.00%          
Increase (decrease) in equity method investments   (1,300)        
(Gain) loss on equity investments   900        
Currency losses   400        
Equity Security            
Fair value measurements            
Payment for investment   3,000        
Gain from conversion   2,500        
Investments   16,500       $ 11,000
India solar operations            
Fair value measurements            
Payments to acquire equity method investment   1,600        
Carrying value   12,900     $ 11,800  
Increase (decrease) in equity method investments   1,100        
Currency losses   200        
Distribution to minority investment partner   300        
Other Assets | Privately Held Investment            
Fair value measurements            
Carrying value   16,600       17,900
Other investments            
Fair value measurements            
Decrease in fair value of level 3 investments   11,300        
Transferring out of level 3   11,000        
Fair value of the remaining level 3 investments   300        
Cash distributions   500        
Income recognized   200        
Other investments | Renewable energy partnership            
Fair value measurements            
Investment Tax Credit       $ 12,000    
Equity investments   2,000       2,300
Investment cost       $ 14,400    
Carrying Value            
Fair value measurements            
Long-term debt   87,700       72,800
Carrying Value | Other Assets | Privately Held Investment            
Fair value measurements            
Investments   1,300       1,300
Level 2 | Estimated Fair Value            
Fair value measurements            
Long-term debt   $ 88,600       $ 73,300