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EARNINGS PER COMMON SHARE - Shares of common stock underlying RSUs (Details) - shares	3 Months Ended		9 Months Ended			12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Restricted stock units
Earnings Per Common Share
Number of shares forfeited				51,907		2,750
Number of shares awarded	80,700	75,026	80,700	75,026
Number of shares vested			73,750	24,343
Restricted stock units | July 1, 2018
Earnings Per Common Share
Number of shares vested	73,750	73,750	73,750	73,750
2019 and 2016 Incentive Plans
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			98,401	89,693
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric			92,748
Total			191,149	89,693
Common shares not included in calculation due applicable metric had not been met at measurement dates			39,603	134,109
2019 and 2016 Incentive Plans | 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				26,456
Total				26,456
Common shares not included in calculation due applicable metric had not been met at measurement dates				47,294
Number of shares forfeited						2,500
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			37,513	25,724
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric			37,513
Total			75,026	25,724
Common shares not included in calculation due applicable metric had not been met at measurement dates				49,302
Number of shares forfeited						2,750
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
Total			75,026	37,513
Common shares not included in calculation due applicable metric had not been met at measurement dates				37,513
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			23,375
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric			17,722
Total			41,097
Common shares not included in calculation due applicable metric had not been met at measurement dates			39,603
2016 Incentive Plan | Restricted stock units
Earnings Per Common Share
Number of shares forfeited				51,907	2,500
Number of shares vested			73,750	24,343

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Represents the common shares attributable to share based payment arrangement not included in calculation of diluted weighted average number of shares due to applicable conditions had not been met at the respective measurement date.

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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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