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EARNINGS PER COMMON SHARE - Earnings Per Common Share - Shares of common stock underlying RSUs (Details) - shares	1 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2010
Earnings Per Common Share
Options outstanding		0	0	0
RSUs
Earnings Per Common Share
Number of shares forfeited		5,250		86,416
Number of shares awarded		77,776	76,250	76,250
Number of shares vested				113,584
2019 and 2016 Incentive Plans
Earnings Per Common Share
Number of underlying shares		225,026	152,500
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric		37,612	68,021
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric		34,771	4,462
Total		72,383	72,483
Common shares not included in calculation due applicable metric had not been met at measurement dates		152,643	80,017
2019 and 2016 Incentive Plans | September 26, 2017
Earnings Per Common Share
Number of underlying shares		76,250	76,250	76,250
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric		22,129	34,633	33,353
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric		31,498	4,462	38,125
Total		53,627	39,095	71,478
Common shares not included in calculation due applicable metric had not been met at measurement dates		22,623	37,155	4,772
2019 and 2016 Incentive Plans | July 1, 2018
Earnings Per Common Share
Number of underlying shares		73,750	76,250
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric		14,755	33,388
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric		3,273
Total		18,028	33,388
Common shares not included in calculation due applicable metric had not been met at measurement dates		55,722	42,862
2019 and 2016 Incentive Plans | July 1, 2019
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		728
Total		728
Common shares not included in calculation due applicable metric had not been met at measurement dates		74,298
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
2009 Incentive Plan | RSUs
Earnings Per Common Share
Number of shares forfeited				86,416
Number of shares awarded					200,000
Number of shares vested	113,584			113,584

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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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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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Number of options outstanding, including both vested and non-vested options.

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