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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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