Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014 segment	Mar. 31, 2013	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Allowance for uncollectible accounts	$ 400,000		$ 400,000
Allowance for uncollectable deferred rent receivables	861,000		940,000
Cash and cash equivalents maximum benchmark (in months)	3 months
Minimum expenditure costs subject to capitalization and depreciation	2,000
Minimum expected future benefit period on expenditures cost to be capitalized and depreciated (in years)	2 years
Minimum transaction cost subject to capitalization and depreciation	1,000
Minimum expected future benefit period on transaction cost to be capitalized and depreciated (in years)	1 year
Maximum transaction costs subject to being expensed as incurred	1,000
Maximum length of lease period for transaction costs to be expensed as incurred	1 year
Increase (decrease) in rental income due to amortization of net intangible assets or liabilities	197,000	(72,000)
Value of in-place leases resulting in a net intangible asset	3,300,000		3,700,000
Accumulated amortization - intangible assets	6,900,000		6,600,000
Intangible assets, weighted average amortization period (in years)	7 years 4 months 24 days
Value of in-place leases resulting in a net intangible liability	4,800,000		5,400,000
Accumulated amortization - intangible liabilities	5,300,000		4,800,000
Intangible liability, weighted average amortization period (in years)	4 years 6 months
Distribution of taxable income requirement	90.00%
Income tax provision	$ 0
Odds of a particular tax position will be sustained upon examination or audit	50.00%
Anti-dilutive share options to purchase	14,000	0
Number of operating segments	1
Maximum [Member] | Building And Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	30 years
Minimum [Member] | Building And Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	5 years