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FAIR VALUE MEASUREMENTS AND INVESTMENTS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Fair value measurements |  |  |  |  |  |
Loss as a result of an observable price change in investment | $ 800 |  |  |  |  |
Loss on equity investments |  |  |  | $ 3,360 | $ 2,131 |
Privately Held Investment |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Payments to acquire equity method investment |  | $ 2,800 |  | 2,800 |  |
Ownership percentage |  | 24.00% |  |  |  |
Increase in carrying value of equity method investment |  |  |  | 1,500 |  |
Loss on equity investments |  |  |  | 1,500 |  |
Currency gains |  |  |  | 200 |  |
Other Assets | Privately Held Investment |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Carrying value | 17,000 |  |  | 17,000 |  | $ 15,500
Short Term Investments |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Equity investments | 100 |  |  | 100 |  | 200
Loss (gain) on equity securities |  |  | $ 0 | 100 | $ 0 |
Other investments |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Equity investments | 10,800 |  |  | 10,800 |  |
Unrealized (loss) gain | (100) |  |  | 600 |  |
Other investments | Renewable energy partnership |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Payments to acquire equity method investment |  |  | $ 14,400 |  |  |
Investment Tax Credit | 12,000 |  |  |  |  |
Equity investments | 2,400 |  |  | 2,400 |  | 2,500
Carrying Value |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Long-term debt | 83,700 |  |  | 83,700 |  | 86,400
Carrying Value | Other Assets |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Strategic investments | 1,300 |  |  | 1,300 |  | 2,100
Level 2 | Estimated Fair Value |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Long-term debt | $ 84,200 |  |  | $ 84,200 |  | $ 86,900

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