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FAIR VALUE MEASUREMENTS AND INVESTMENTS - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Fair value measurements            
Loss as a result of an observable price change in investment $ 800          
Loss on equity investments       $ 3,360 $ 2,131  
Privately Held Investment            
Fair value measurements            
Payments to acquire equity method investment   $ 2,800   2,800    
Ownership percentage   24.00%        
Increase in carrying value of equity method investment       1,500    
Loss on equity investments       1,500    
Currency gains       200    
Other Assets | Privately Held Investment            
Fair value measurements            
Carrying value 17,000     17,000   $ 15,500
Short Term Investments            
Fair value measurements            
Equity investments 100     100   200
Loss (gain) on equity securities     $ 0 100 $ 0  
Other investments            
Fair value measurements            
Equity investments 10,800     10,800    
Unrealized (loss) gain (100)     600    
Other investments | Renewable energy partnership            
Fair value measurements            
Payments to acquire equity method investment     $ 14,400      
Investment Tax Credit 12,000          
Equity investments 2,400     2,400   2,500
Carrying Value            
Fair value measurements            
Long-term debt 83,700     83,700   86,400
Carrying Value | Other Assets            
Fair value measurements            
Strategic investments 1,300     1,300   2,100
Level 2 | Estimated Fair Value            
Fair value measurements            
Long-term debt $ 84,200     $ 84,200   $ 86,900