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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net Income Per Share Of Common Stock [Abstract]
Common stock dividend declared, percent									5.00%	10.00%	10.00%
Average shares outstanding	21,390,053	21,449,751	21,513,493	21,616,141	19,454,943	19,465,072	19,500,916	19,544,758	22,555,240	22,507,701	22,368,941