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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Fair value measurements    
Equity investments with readily determinable fair values $ 500  
Loss on equity securities 100  
Impairment or price adjustments for strategic investments 0  
Carrying Value    
Fair value measurements    
Long-term debt 154,900 $ 155,800
Carrying Value | Other Assets    
Fair value measurements    
Strategic investments 20,100 20,100
Level 2 | Estimated Fair Value    
Fair value measurements    
Long-term debt 158,100 159,200
Recurring basis    
Fair value measurements    
Total assets and liabilities measured at fair value 55,731 60,367
Recurring basis | Interest rate swap    
Fair value measurements    
Derivative liabilities 186 52
Recurring basis | Certificate of deposit    
Fair value measurements    
Cash and cash equivalents 380 391
Recurring basis | Money market funds    
Fair value measurements    
Cash and cash equivalents 2,388 2,894
Recurring basis | Short Term Investments    
Fair value measurements    
Investments 2,228 7,076
Recurring basis | Commercial paper    
Fair value measurements    
Cash and cash equivalents 50,549 49,954
Recurring basis | Level 1    
Fair value measurements    
Total assets and liabilities measured at fair value 2,859 3,449
Recurring basis | Level 1 | Money market funds    
Fair value measurements    
Cash and cash equivalents 2,388 2,894
Recurring basis | Level 1 | Short Term Investments    
Fair value measurements    
Investments 471 555
Recurring basis | Level 2    
Fair value measurements    
Total assets and liabilities measured at fair value 52,872 56,918
Recurring basis | Level 2 | Interest rate swap    
Fair value measurements    
Derivative liabilities 186 52
Recurring basis | Level 2 | Certificate of deposit    
Fair value measurements    
Cash and cash equivalents 380 391
Recurring basis | Level 2 | Short Term Investments    
Fair value measurements    
Investments 1,757 6,521
Recurring basis | Level 2 | Commercial paper    
Fair value measurements    
Cash and cash equivalents $ 50,549 $ 49,954