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FAIR VALUE MEASUREMENTS AND INVESTMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2019
Fair value measurements        
Acquired additional securities $ 2,768   $ 10,000  
Increase in carrying value $ (1,775)      
Privately Held Investment        
Fair value measurements        
Ownership percentage 24.00%      
Additional investment $ 2,800      
Increase in carrying value 300      
Share investee loss 300      
Currency losses 2,200      
Other assets | Privately Held Investment        
Fair value measurements        
Carrying value 15,800      
Carrying Value        
Fair value measurements        
Long-term debt 85,500     $ 86,400
Carrying Value | Other assets        
Fair value measurements        
Strategic investments 2,100     2,100
Short Term Investments        
Fair value measurements        
Equity investments 100     200
Loss (gain) on equity securities 100   $ 0  
Other investments        
Fair value measurements        
Equity investments 10,500      
Increase in carrying value 300      
Other investments | Renewable energy partnership        
Fair value measurements        
Investment cost   $ 14,400    
Investment Tax Credit   $ 12,000    
Equity investments 2,500     2,500
Level 2 | Estimated Fair Value        
Fair value measurements        
Long-term debt 86,000     86,900
Level 2 | Interest rate swap        
Fair value measurements        
Unrealized loss 200      
Recurring basis        
Fair value measurements        
Total assets and liabilities measured at fair value 15,276     15,769
Recurring basis | Certificate of deposit        
Fair value measurements        
Cash and cash equivalents 380     380
Recurring basis | Money market funds        
Fair value measurements        
Cash and cash equivalents 2,028     2,329
Recurring basis | Short Term Investments        
Fair value measurements        
Investments 104     416
Recurring basis | Other investments        
Fair value measurements        
Investments 12,996     12,700
Recurring basis | Interest rate swap        
Fair value measurements        
Derivative liabilities (232)     (56)
Recurring basis | Level 1        
Fair value measurements        
Total assets and liabilities measured at fair value 2,132     2,745
Recurring basis | Level 1 | Money market funds        
Fair value measurements        
Cash and cash equivalents 2,028     2,329
Recurring basis | Level 1 | Short Term Investments        
Fair value measurements        
Investments 104     416
Recurring basis | Level 2        
Fair value measurements        
Total assets and liabilities measured at fair value 148     324
Recurring basis | Level 2 | Certificate of deposit        
Fair value measurements        
Cash and cash equivalents 380     380
Recurring basis | Level 2 | Interest rate swap        
Fair value measurements        
Derivative liabilities (232)     (56)
Recurring basis | Level 3        
Fair value measurements        
Total assets and liabilities measured at fair value 12,996     12,700
Recurring basis | Level 3 | Other investments        
Fair value measurements        
Investments $ 12,996     $ 12,700