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FAIR VALUE MEASUREMENTS AND INVESTMENTS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Fair value measurements |  |  |  |  |  |
Payment for investment |  | $ 4,155 |  |  |  |
Loss on equity investments | $ (4,222) | $ (2,188) |  |  |  |
Privately Held Investment |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Payments to acquire equity method investment |  |  | $ 2,800 |  |  |
Ownership percentage |  |  | 24.00% |  |  |
Loss on equity investments |  |  |  | $ 400 |  |
Currency gains (losses) |  |  |  | 400 |  |
Equity Security |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Investments | 16,500 |  |  | 16,500 |  |
India solar operations |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Carrying value | 13,400 |  |  | 13,900 |  |
Decrease in equity method investments | 500 |  |  |  |  |
Currency gains (losses) | (200) |  |  |  |  |
Operating losses on equity investments | 300 |  |  |  |  |
Other Assets | Privately Held Investment |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Carrying value | 14,800 |  |  | 14,800 |  |
Other investments |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Remaining Level 3 investments increase | 100 |  |  |  |  |
Other investments | Renewable energy partnership |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Investment Tax Credit |  |  |  |  | $ 12,000 |
Equity investments | 2,000 |  |  | 1,900 |  |
Investment cost |  |  |  |  |  | $ 14,400
Carrying Value |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Long-term debt | 394,000 |  |  | 366,500 |  |
Carrying Value | Other Assets | Equity Security |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Investments | 6,100 |  |  | 1,300 |  |
Increase due to gain recognized | 4,800 |  |  |  |  |
Level 2 | Total |  |  |  |  |  |
Fair value measurements |  |  |  |  |  |
Long-term debt | $ 400,800 |  |  | $ 373,700 |  |

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