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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 28A -URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1500-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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