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EARNINGS PER COMMON SHARE - Shares of common stock underlying RSUs (Details) - shares	3 Months Ended		6 Months Ended			12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019
RSUs
Earnings Per Common Share
Number of shares forfeited		51,907		51,907			2,750
Number of shares vested	73,750	24,343	73,750	24,343
RSUs | September 26, 2017
Earnings Per Common Share
Number of shares forfeited						51,907
Number of shares vested						24,343
RSUs | 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			223,802	225,026
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric			111,901	49,572
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric			111,901
Total			223,802	49,572
Common shares not included in calculation due applicable metric had not been met at measurement dates				175,454
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				24,343
Total				24,343
Common shares not included in calculation due applicable metric had not been met at measurement dates				51,907
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			36,875	17,967
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric			36,875
Total			73,750	17,967
Common shares not included in calculation due applicable metric had not been met at measurement dates				55,783
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	7,262
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric			37,513
Total			75,026	7,262
Common shares not included in calculation due applicable metric had not been met at measurement dates				67,764
Number of shares forfeited							2,750
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	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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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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