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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value Instruments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Fair value measurements        
Loss as a result of an observable price change in investment   $ 800    
Loss on equity investments   3,427 $ 4,724  
Privately Held Investment        
Fair value measurements        
Ownership percentage 24.00%      
Payments to acquire equity method investment $ 2,800 2,800    
Increase in carrying value of equity method investment   2,400    
Currency gains   1,600    
Loss on equity investments   2,000    
Privately Held Investment | Other Assets        
Fair value measurements        
Carrying value   17,900 15,500  
Carrying Value        
Fair value measurements        
Long-term debt   72,800 86,400  
Carrying Value | Other Assets        
Fair value measurements        
Investments   1,300 2,100  
Short Term Investments        
Fair value measurements        
Equity investments     200  
Loss (gain) on equity securities   200 100  
Other investments        
Fair value measurements        
Equity investments   11,000    
Unrealized (loss) gain   800 200  
Other investments | Renewable energy partnership        
Fair value measurements        
Equity investments   2,300 2,500  
Investment cost       $ 14,400
Investment tax credit   12,000    
Level 2 | Estimated Fair Value        
Fair value measurements        
Long-term debt   $ 73,300 $ 86,900