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Earnings Per Common Share - Shares of common stock underlying RSUs (Details) - 2019 and 2016 Incentive Plans - shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Earnings Per Common Share |  |  |  |
Number of underlying shares | 230,276 | 230,276 | 230,276 | 230,276
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric | 64,329 | 64,453 | 64,329 | 64,453
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric | 27,224 | 38,125 | 27,224 | 38,125
Total | 91,553 | 102,578 | 91,553 | 102,578
September 26, 2017 |  |  |  |
Earnings Per Common Share |  |  |  |
Number of underlying shares | 76,250 | 76,250 | 76,250 | 76,250
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric | 26,840 | 33,524 | 26,840 | 33,524
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric | 27,224 | 38,125 | 27,224 | 38,125
Total | 54,064 | 71,649 | 54,064 | 71,649
Number of remaining shares at the respective measurement dates | 22,186 | 4,601 | 22,186 | 4,601
July 1, 2018 |  |  |  |
Earnings Per Common Share |  |  |  |
Number of underlying shares | 76,250 | 76,250 | 76,250 | 76,250
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric | 22,321 | 30,929 | 22,321 | 30,929
Total | 22,321 | 30,929 | 22,321 | 30,929
Number of remaining shares at the respective measurement dates | 53,929 | 45,321 | 53,929 | 45,321
July 1, 2019 |  |  |  |
Earnings Per Common Share |  |  |  |
Number of underlying shares | 77,776 |  | 77,776 |
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric | 15,168 |  | 15,168 |
Total | 15,168 |  | 15,168 |
Number of remaining shares at the respective measurement dates |  |  | 62,608 |

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