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FAIR VALUE MEASUREMENTS AND INVESTMENTS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2019 | Jan. 31, 2021 | Dec. 31, 2020
Fair value measurements |  |  |  |  |  |
Payment for investment |  | $ 5,242 | $ 2,768 |  |  |
(Gain) loss on equity investments |  | (1,793) | $ 1,412 |  |  |
Privately Held Investment |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Payments to acquire equity method investment | $ 2,800 |  |  |  |  |
Ownership percentage | 24.00% |  |  |  |  |
Increase (decrease) in equity method investments |  | (1,300) |  |  |  |
(Gain) loss on equity investments |  | 900 |  |  |  |
Currency losses |  | 400 |  |  |  |
Equity Security |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Payment for investment |  | 3,000 |  |  |  |
Gain from conversion |  | 2,500 |  |  |  |
Investments |  | 16,500 |  |  |  | $ 11,000
India solar operations |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Payments to acquire equity method investment |  | 1,600 |  |  |  |
Carrying value |  | 12,900 |  |  | $ 11,800 |
Increase (decrease) in equity method investments |  | 1,100 |  |  |  |
Currency losses |  | 200 |  |  |  |
Distribution to minority investment partner |  | 300 |  |  |  |
Other Assets | Privately Held Investment |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Carrying value |  | 16,600 |  |  |  | 17,900
Other investments |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Decrease in fair value of level 3 investments |  | 11,300 |  |  |  |
Transferring out of level 3 |  | 11,000 |  |  |  |
Fair value of the remaining level 3 investments |  | 300 |  |  |  |
Cash distributions |  | 500 |  |  |  |
Income recognized |  | 200 |  |  |  |
Other investments | Renewable energy partnership |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Investment Tax Credit |  |  |  | $ 12,000 |  |
Equity investments |  | 2,000 |  |  |  | 2,300
Investment cost |  |  |  | $ 14,400 |  |
Carrying Value |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Long-term debt |  | 87,700 |  |  |  | 72,800
Carrying Value | Other Assets | Privately Held Investment |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Investments |  | 1,300 |  |  |  | 1,300
Level 2 | Estimated Fair Value |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Long-term debt |  | $ 88,600 |  |  |  | $ 73,300

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