Investments In Real Estate (Narrative) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014 sqft property	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014 sqft property	Dec. 31, 2013	Dec. 31, 2012	Feb. 11, 2015 property sqft
Finite Lived Intangible Assets [Line Items]
Number of properties	126								126			11
Area of real estate property	9,300,000								9,300,000			641,593
Total aggregate initial investment									$ 236,700,000	$ 212,400,000
Recorded revenues	18,747,000	17,714,000	16,610,000	15,804,000	13,169,000	11,516,000	10,815,000	10,029,000	68,875,000	45,529,000	29,335,000
2014 Acquisition [Member]
Finite Lived Intangible Assets [Line Items]
Total aggregate initial investment									236,700,000
Number of mortgage loans									2
Assumption of mortgage loan, total principal	8,500,000								8,500,000
Fixed interest rate	5.74%								5.74%
Land	88,700,000								88,700,000
Building And Improvements	136,000,000								136,000,000
Intangible assets	12,000,000								12,000,000
Intangible liabilities									1,300,000
Recorded revenues									7,000,000
Recorded net income									2,900,000
2013 Acquisition [Member]
Finite Lived Intangible Assets [Line Items]
Total aggregate initial investment										212,400,000
Land					90,800,000					90,800,000
Building And Improvements					110,800,000					110,800,000
Intangible assets					10,800,000					10,800,000
Intangible liabilities										1,400,000
Recorded revenues										5,200,000
Recorded net income										1,300,000
Redevelopment Property [Member] | 2013 Acquisition [Member]
Finite Lived Intangible Assets [Line Items]
Number of properties					1					1
Area of real estate property					69,500					69,500
Improved Land Parcel [Member] | 2014 Acquisition [Member]
Finite Lived Intangible Assets [Line Items]
Number of properties	1								1
Area of real estate property	1.2								1.2
Improved Land Parcel [Member] | 2013 Acquisition [Member]
Finite Lived Intangible Assets [Line Items]
Number of properties					1					1
Area of real estate property					2.3					2.3
Wholly Owned Properties [Member]
Finite Lived Intangible Assets [Line Items]
Number of properties	29				30				29	30
Area of real estate property	2,266,082				1,916,394				2,266,082	1,916,394
Purchase price	$ 235,741,000				$ 205,521,000				$ 235,741,000	$ 205,521,000