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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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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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