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EARNINGS PER COMMON SHARE - Shares of common stock underlying RSUs (Details) - shares	1 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Common Share
Options outstanding			0	0	0
Restricted stock units
Earnings Per Common Share
Number of shares forfeited				51,907	5,250
Number of shares awarded			80,700	75,026	77,776
Number of shares vested			73,750	24,343
Restricted stock units | July 1, 2018
Earnings Per Common Share
Number of shares vested	73,750
Restricted stock units | 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			230,752	223,802	225,026
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric			115,376	85,569	37,612
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric			115,376	37,513	34,771
Total			230,752	123,082	72,383
Common shares not included in calculation due applicable metric had not been met at measurement dates				100,720	152,643
2019 and 2016 Incentive Plans | 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
2019 and 2016 Incentive Plans | 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
2019 and 2016 Incentive Plans | July 1, 2019
Earnings Per Common Share
Number of underlying shares			75,026	75,026	75,026
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric			37,513	23,233	728
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric			37,513
Total			75,026	23,233	728
Common shares not included in calculation due applicable metric had not been met at measurement dates				51,793	74,298
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				24,823	14,755
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric					3,273
Total				24,823	18,028
Common shares not included in calculation due applicable metric had not been met at measurement dates				48,927	55,722
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					22,129
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric					31,498
Total					53,627
Common shares not included in calculation due applicable metric had not been met at measurement dates					22,623
2019 and 2016 Incentive Plans | Awards granted in 2018
Earnings Per Common Share
Number of shares forfeited					2,500
2019 and 2016 Incentive Plans | Awards granted in 2019
Earnings Per Common Share
Number of shares forfeited					2,750
2016 Incentive Plan | Restricted stock units | Awards granted in 2018
Earnings Per Common Share
Number of shares forfeited					2,500
Number of shares awarded						76,250
Number of shares vested			73,750

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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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