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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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Represents the common shares attributable to share based payment arrangement not included in calculation of diluted weighted average number of shares due to applicable conditions had not been met at the respective measurement date.

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