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Earnings Per Common Share - Shares of common stock underlying RSUs (Details) - shares	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
2019 and 2016 Incentive Plans
Earnings Per Common Share
Number of underlying shares	223,802	230,276	223,802	230,276
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric	89,693	64,329	89,693	64,329
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric		27,224		27,224
Total	89,693	91,553	89,693	91,553
Common shares not included in calculation due applicable metric had not been met at measurement dates	134,109	138,723	134,109	138,723
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		26,840		26,840
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric		27,224		27,224
Total		54,064		54,064
Common shares not included in calculation due applicable metric had not been met at measurement dates		22,186		22,186
2019 and 2016 Incentive Plans | July 1, 2018
Earnings Per Common Share
Number of underlying shares	73,750	76,250	73,750	76,250
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric	26,456	22,321	26,456	22,321
Total	26,456	22,321	26,456	22,321
Common shares not included in calculation due applicable metric had not been met at measurement dates	47,294	53,929	47,294	53,929
2019 and 2016 Incentive Plans | July 1, 2019
Earnings Per Common Share
Number of underlying shares	75,026	77,776	75,026	77,776
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric	25,724	15,168	25,724	15,168
Total	25,724	15,168	25,724	15,168
Common shares not included in calculation due applicable metric had not been met at measurement dates	49,302	62,608	49,302	62,608
2019 and 2016 Incentive Plans | August 3, 2020
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	37,513		37,513
Total	37,513		37,513
Common shares not included in calculation due applicable metric had not been met at measurement dates	37,513		37,513
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		5,250
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period			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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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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