Real Estate Assets, Discontinued Operations and Assets Held for Sale (Table Illustration of Number of Properties in Discontinued Operations) (Details) - buildings	3 Months Ended	9 Months Ended
	Mar. 31, 2020	Sep. 30, 2020
Continuing Operations, Number of In-service Properties Held for Sale		0
Continuing Operations, Number of Real Estate Properties Sold	28	2
Total Properties Sold or Classified as Held for Sale		30