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FAIR VALUE MEASUREMENTS (Details) - USD ($)
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Fair value measurements      
Equity investments with readily determinable fair values $ 200,000   $ 200,000
Purchase of other investments 10,000,000 $ 2,000,000  
Change in fair value of other investment 0    
Change in fair value of interest rate derivative 0    
Impairment or price adjustments for strategic investments 0    
Carrying Value      
Fair value measurements      
Long-term debt 90,000,000.0   91,000,000.0
Carrying Value | Other Assets      
Fair value measurements      
Strategic investments 23,100,000   23,100,000
Level 2 | Estimated Fair Value      
Fair value measurements      
Long-term debt 89,700,000   91,600,000
Recurring basis      
Fair value measurements      
Total assets and liabilities measured at fair value 17,952,000   17,151,000
Recurring basis | Interest rate swap      
Fair value measurements      
Derivative assets     140,000
Derivative liabilities (43,000)    
Recurring basis | Certificate of deposit      
Fair value measurements      
Cash and cash equivalents 380,000   380,000
Recurring basis | Money market funds      
Fair value measurements      
Cash and cash equivalents 2,335,000   2,266,000
Recurring basis | Short Term Investments      
Fair value measurements      
Investments 5,280,000   393,000
Recurring basis | Other investments      
Fair value measurements      
Investments 10,000,000    
Recurring basis | Commercial paper      
Fair value measurements      
Investments     13,972,000
Recurring basis | Level 1      
Fair value measurements      
Total assets and liabilities measured at fair value 7,615,000   2,659,000
Recurring basis | Level 1 | Money market funds      
Fair value measurements      
Cash and cash equivalents 2,335,000   2,266,000
Recurring basis | Level 1 | Short Term Investments      
Fair value measurements      
Investments 5,280,000   393,000
Recurring basis | Level 2      
Fair value measurements      
Total assets and liabilities measured at fair value 337,000   14,492,000
Recurring basis | Level 2 | Interest rate swap      
Fair value measurements      
Derivative assets     140,000
Derivative liabilities (43,000)    
Recurring basis | Level 2 | Certificate of deposit      
Fair value measurements      
Cash and cash equivalents 380,000   380,000
Recurring basis | Level 2 | Commercial paper      
Fair value measurements      
Investments     $ 13,972,000
Recurring basis | Level 3      
Fair value measurements      
Total assets and liabilities measured at fair value 10,000,000    
Recurring basis | Level 3 | Other investments      
Fair value measurements      
Investments $ 10,000,000