Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Minimum Percentage of Adjusted Taxable Income to be Distributed to Shareholders as a Real Estate Investment Trust	90.00%
Minimum [Member] | Land, Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	10 years
Minimum [Member] | Furniture Fixtures And Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	1 year
Maximum [Member] | Land, Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	40 years
Maximum [Member] | Furniture Fixtures And Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	10 years