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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 |

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