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Earnings Per Common Share - Shares of common stock underlying RSUs (Details) - shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Common Share
Number of underlying shares	225,026
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric	58,720
Total	58,720
Common shares not included in calculation due applicable metric had not been met at measurement dates	166,306
September 26, 2017
Earnings Per Common Share
Number of underlying shares	76,250
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric	26,036
Total	26,036
Common shares not included in calculation due applicable metric had not been met at measurement dates	50,214
July 1, 2018
Earnings Per Common Share
Number of underlying shares	73,750
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric	20,423
Total	20,423
Common shares not included in calculation due applicable metric had not been met at measurement dates	53,327
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	12,261
Total	12,261
Common shares not included in calculation due applicable metric had not been met at measurement dates	62,765
2019 and 2016 Incentive Plans
Earnings Per Common Share
Number of underlying shares		152,500
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric		64,955
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric		76,250
Total		141,205
Common shares not included in calculation due applicable metric had not been met at measurement dates		11,295
2019 and 2016 Incentive Plans | September 26, 2017
Earnings Per Common Share
Number of underlying shares		76,250
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric		33,611
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric		38,125
Total		71,736
Common shares not included in calculation due applicable metric had not been met at measurement dates		4,514
2019 and 2016 Incentive Plans | July 1, 2018
Earnings Per Common Share
Number of underlying shares		76,250
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric		31,344
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric		38,125
Total		69,469
Common shares not included in calculation due applicable metric had not been met at measurement dates		6,781
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

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