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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 |  |

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