Net Income Per Share Of Common Stock (Narrative) (Details) - shares	3 Months Ended				12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net Income Per Share Of Common Stock [Abstract]
Common stock dividend declared, percent						5.00%	10.00%
Average shares outstanding	21,390,053	21,449,751	21,513,493	21,616,141	22,642,057	22,555,240	22,507,701