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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Fair value measurements    
Equity investments with readily determinable fair values $ 300 $ 300
Purchase of other investments 10,000  
Impairment or price adjustments for strategic investments 0  
Carrying Value    
Fair value measurements    
Long-term debt 90,100 91,000
Carrying Value | Other Assets    
Fair value measurements    
Strategic investments 33,100 23,100
Level 2 | Estimated Fair Value    
Fair value measurements    
Long-term debt 90,600 91,600
Recurring basis    
Fair value measurements    
Total assets and liabilities measured at fair value 32,320 17,151
Recurring basis | Interest rate swap    
Fair value measurements    
Derivative liabilities 70 140
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 2,615 2,266
Recurring basis | Short Term Investments    
Fair value measurements    
Investments 5,280 393
Recurring basis | Other investments    
Fair value measurements    
Investments 10,000  
Recurring basis | Commercial paper    
Fair value measurements    
Investments 13,975 13,972
Recurring basis | Level 1    
Fair value measurements    
Total assets and liabilities measured at fair value 7,895 2,659
Recurring basis | Level 1 | Money market funds    
Fair value measurements    
Cash and cash equivalents 2,615 2,266
Recurring basis | Level 1 | Short Term Investments    
Fair value measurements    
Investments 5,280 393
Recurring basis | Level 2    
Fair value measurements    
Total assets and liabilities measured at fair value 14,425 14,492
Recurring basis | Level 2 | Interest rate swap    
Fair value measurements    
Derivative liabilities 70 140
Recurring basis | Level 2 | Certificate of deposit    
Fair value measurements    
Cash and cash equivalents 380 380
Recurring basis | Level 2 | Commercial paper    
Fair value measurements    
Investments 13,975 $ 13,972
Recurring basis | Level 3    
Fair value measurements    
Total assets and liabilities measured at fair value 10,000  
Recurring basis | Level 3 | Other investments    
Fair value measurements    
Investments $ 10,000