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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Earnings Per Common Share |  |  |  |  |
Number of underlying shares |  | 152,500 |  | 152,500 |
September 26, 2017 |  |  |  |  |
Earnings Per Common Share |  |  |  |  |
Number of underlying shares |  | 76,250 |  | 76,250 |
July 1, 2018 |  |  |  |  |
Earnings Per Common Share |  |  |  |  |
Number of underlying shares |  | 76,250 |  | 76,250 |
2019 and 2016 Incentive Plans |  |  |  |  |
Earnings Per Common Share |  |  |  |  |
Number of underlying shares | 225,026 |  | 225,026 |  |
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric | 49,572 | 62,595 | 49,572 | 62,595 |
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric |  | 76,250 |  | 76,250 |
Total | 49,572 | 138,845 | 49,572 | 138,845 |
Common shares not included in calculation due applicable metric had not been met at measurement dates | 175,454 | 13,655 | 175,454 | 13,655 |
2019 and 2016 Incentive Plans | September 26, 2017 |  |  |  |  |
Earnings Per Common Share |  |  |  |  |
Number of underlying shares | 76,250 |  | 76,250 |  |
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric | 24,343 | 32,824 | 24,343 | 32,824 |
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric |  | 38,125 |  | 38,125 |
Total | 24,343 | 70,949 | 24,343 | 70,949 |
Common shares not included in calculation due applicable metric had not been met at measurement dates | 51,907 | 5,301 | 51,907 | 5,301 |
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 | 17,967 | 29,771 | 17,967 | 29,771 |
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric |  | 38,125 |  | 38,125 |
Total | 17,967 | 67,896 | 17,967 | 67,896 |
Common shares not included in calculation due applicable metric had not been met at measurement dates | 55,783 | 8,354 | 55,783 | 8,354 |
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 | 7,262 |  | 7,262 |  |
Total | 7,262 |  | 7,262 |  |
Common shares not included in calculation due applicable metric had not been met at measurement dates | 67,764 |  | 67,764 |  |
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 |  |
RSUs |  |  |  |  |
Earnings Per Common Share |  |  |  |  |
Number of shares forfeited | 51,907 |  | 51,907 |  | 5,250
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | 24,343 |  | 24,343 |  |
RSUs | September 26, 2017 |  |  |  |  |
Earnings Per Common Share |  |  |  |  |
Number of shares forfeited | 51,907 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | 24,343 |  |  |  |

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