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EARNINGS PER COMMON SHARE - Shares of common stock underlying RSUs (Details) - shares | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Earnings Per Common Share |  |  |  |  |  |
Number of underlying shares |  | 230,752 | 223,802 |  |  |
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric |  | 115,376 | 86,789 |  |  |
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric |  | 115,376 | 37,513 |  |  |
Total |  | 230,752 | 124,302 |  |  |
Common shares not included in calculation due applicable metric had not been met at measurement dates |  |  | 99,500 |  |  |
August 3, 2021 |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of underlying shares |  | 80,700 |  |  |  |
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric |  | 40,350 |  |  |  |
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric |  | 40,350 |  |  |  |
Total |  | 80,700 |  |  |  |
August 3, 2020 |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of underlying shares |  | 75,026 | 75,026 |  |  |
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric |  | 37,513 | 37,513 |  |  |
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric |  | 37,513 | 37,513 |  |  |
Total |  | 75,026 | 75,026 |  |  |
July 1, 2019 |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of underlying shares |  | 75,026 | 75,026 |  |  |
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric |  | 37,513 | 23,970 |  |  |
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric |  | 37,513 |  |  |  |
Total |  | 75,026 | 23,970 |  |  |
Common shares not included in calculation due applicable metric had not been met at measurement dates |  |  | 51,056 |  |  |
July 1, 2018 |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of underlying shares |  |  | 73,750 |  |  |
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric |  |  | 25,306 |  |  |
Total |  |  | 25,306 |  |  |
Common shares not included in calculation due applicable metric had not been met at measurement dates |  |  | 48,444 |  |  |
Restricted stock units |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of shares awarded |  |  |  | 80,700 | 75,026 | 77,776
Restricted stock units | July 1, 2018 |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of shares vested | 73,750 |  |  |  |  |
Restricted stock units | Awards granted in 2018 |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of shares forfeited |  |  |  |  |  | 2,500
Restricted stock units | Awards granted in 2019 |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of shares forfeited |  |  |  |  |  | 2,750

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