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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
	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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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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-Publisher FASB
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