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RECEIVABLES - Summary of Accounts Receivable (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Receivables [Abstract] |  |  |
Trade accounts receivable | $ 170,654 | $ 161,751 |
Unbilled receivables | 45,295 | 35,933 |
Allowance for credit losses | (8,170) | (8,912) | $ (9,918)
Total | $ 207,779 | $ 188,772 |
Accounts receivable, payment terms | 30 days |  |

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