Net Income Per Share of Common Stock (Details) - shares	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Common stock dividend declared, percent									10.00%	10.00%	5.00%
Average shares outstanding	19,454,943	19,465,072	19,500,916	19,544,758	17,565,590	17,610,573	17,641,979	17,620,521	21,435,906	21,303,753	21,037,002