Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands													3 Months Ended	12 Months Ended
	Oct. 28, 2019	Aug. 02, 2019	Apr. 30, 2019	Feb. 08, 2019	Oct. 30, 2018	Aug. 03, 2018	May 01, 2018	Feb. 02, 2018	Oct. 31, 2017	Aug. 04, 2017	May 02, 2017	Feb. 09, 2017	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Dividends [Abstract]
Dividend per Common Share	$ 0.32	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 0.28	$ 0.28	$ 0.28	$ 0.28	$ 0.26	$ 0.26	$ 0.26	$ 0.32	$ 1.22	$ 1.14	$ 1.06
Aggregate Dividend Amount	$ 23,884	$ 22,390	$ 22,536	$ 22,518	$ 22,867	$ 21,870	$ 21,908	$ 22,085	$ 22,039	$ 20,464	$ 20,482	$ 20,466		$ 91,328	$ 88,730	$ 83,433