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STOCK-BASED COMPENSATION PLANS - Narrative (Details) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 26, 2021 shares | Mar. 16, 2020 shares | Mar. 31, 2022 USD ($) performance_period shares | Mar. 31, 2021 USD ($) | Mar. 31, 2019 | Dec. 31, 2021 shares | Dec. 31, 2020 | Dec. 31, 2019
Stock-based compensation |  |  |  |  |  |  |  |
Total intrinsic values of stock options exercised (in dollars per share) | $ |  |  | $ 0 |  |  |  |  |
Cash received from the exercise of stock options (in dollars per share) | $ |  |  | 0 |  |  |  |  |
Total fair value of restricted stock awards, restricted stock units and performance-based stock units on date vested | $ |  |  | 5,533 | $ 28,182 |  |  |  |
Fair value of the assumed awards attributable to future stock-based compensation expense | $ |  |  | $ 21,100 |  |  |  |  |
Expected period for unrecognized expense |  |  | 2 years |  |  |  |  |
RSUs |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Eligible to vest (in shares) |  |  | 3,711,148 |  |  | 5,389,611 |  |
Granted (in shares) |  |  | 71,077 |  |  |  |  |
PSUs |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Eligible to vest (in shares) |  |  | 4,547,092 |  |  | 4,987,876 |  |
Granted (in shares) |  |  | 18,225 |  |  |  |  |
Total fair value of restricted stock awards, restricted stock units and performance-based stock units on date vested | $ |  |  | $ 900 |  |  |  |  |
Performance Shares, Performance Based |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Granted percentage |  |  |  |  |  | 60.00% | 60.00% | 60.00%
Number of performance periods | performance_period |  |  | 3 |  |  |  |  |
Percent of performance metrics achieved |  |  | 200.00% |  |  |  |  |
Vesting percentage |  |  | 33.33% |  |  |  |  |
Service period |  |  | 3 years |  |  |  |  |
Performance Shares, Market Based |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Granted percentage |  |  |  |  | 40.00% | 40.00% | 40.00% |
Number of performance periods | performance_period |  |  | 1 |  |  |  |  |
Percent of performance metrics achieved |  |  | 200.00% |  |  |  |  |
Performance period (in years) |  |  | 3 years |  |  |  |  |
RSAs and RSUs |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Total fair value of restricted stock awards, restricted stock units and performance-based stock units on date vested | $ |  |  | $ 10,300 |  |  |  |  |
Chief Executive Officer | RSUs |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Eligible to vest (in shares) |  | 462,963 |  |  |  |  |  |
Chief Executive Officer | PSUs |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Maximum number of shares to be settled (in shares) |  | 4,750,000 |  |  |  |  |  |
Granted (in shares) | 1,333,333 |  |  |  |  |  |  |

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