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EARNINGS PER COMMON SHARE - Shares of common stock underlying RSUs (Details) - shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
RSUs |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of shares forfeited |  |  |  | 5,250 |  |
Number of shares awarded |  |  | 75,026 | 77,776 | 76,250 |
RSUs | September 26, 2017 |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of shares forfeited |  |  | 51,907 |  |  |
Number of shares vested |  |  | 24,343 |  |  |
2019 and 2016 Incentive Plans |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of underlying shares | 223,802 | 225,026 |  |  |  |
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric | 86,789 | 58,720 |  |  |  |
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric | 37,513 |  |  |  |  |
Total | 124,302 | 58,720 |  |  |  |
Common shares not included in calculation due applicable metric had not been met at measurement dates | 99,500 | 166,306 |  |  |  |
2019 and 2016 Incentive Plans | September 26, 2017 |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of underlying shares |  | 76,250 |  |  |  |
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric |  | 26,036 |  |  |  |
Total |  | 26,036 |  |  |  |
Common shares not included in calculation due applicable metric had not been met at measurement dates |  | 50,214 |  |  |  |
2019 and 2016 Incentive Plans | July 1, 2018 |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of underlying shares | 73,750 | 73,750 |  |  |  |
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric | 25,306 | 20,423 |  |  |  |
Total | 25,306 | 20,423 |  |  |  |
Common shares not included in calculation due applicable metric had not been met at measurement dates | 48,444 | 53,327 |  |  |  |
Number of shares forfeited |  |  |  | 2,750 |  |
2019 and 2016 Incentive Plans | 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 | 23,970 | 12,261 |  |  |  |
Total | 23,970 | 12,261 |  |  |  |
Common shares not included in calculation due applicable metric had not been met at measurement dates | 51,056 | 62,765 |  |  |  |
Number of shares forfeited |  |  |  | 2,500 |  |
2019 and 2016 Incentive Plans | August 3, 2020 |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of underlying shares | 75,026 |  |  |  |  |
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric | 37,513 |  |  |  |  |
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric | 37,513 |  |  |  |  |
Total | 75,026 |  |  |  |  |
2016 Incentive Plan | RSUs |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of shares forfeited |  |  | 51,907 |  |  |
Number of shares awarded |  |  |  |  |  | 76,250
Number of shares vested |  |  | 24,343 |  |  |

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