Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) segment	Sep. 30, 2018 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
Operating lease, liability	$ 17,764		$ 17,764
Payroll related costs capitalized		$ 338		$ 949
Taxable income minimum distribution portion not subject to federal taxation (in percentage)	90.00%		90.00%
Real estate improvements			$ 28,700	30,200
Acquisition costs	$ 0	$ 0	0	$ 0
Allowance for doubtful accounts receivable	$ 8,000		$ 8,000			$ 6,900
Number of segments | segment			1
Accounting Standards Update 2016-02
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
Operating lease, liability					$ 18,000
Operating lease, right-of-use asset					$ 17,000
Minimum | Building
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
PPE useful life (in years)			39 years
Minimum | Building Improvements
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
PPE useful life (in years)			10 years
Minimum | Furniture and Fixtures
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
PPE useful life (in years)			3 years
Maximum | Building
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
PPE useful life (in years)			40 years
Maximum | Building Improvements
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
PPE useful life (in years)			20 years
Maximum | Furniture and Fixtures
Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items]
PPE useful life (in years)			10 years