Derivative Financial Instruments (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) numberOfRefinancings	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) numberOfRefinancings	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Derivative [Line Items]
Number of mortgage refinancings | numberOfRefinancings	2		2
Estimated amount to be reclassified from Accumulated other comprehensive income (loss) as an increase to interest expense	$ 135,000		$ 135,000
Interest Expense
Derivative [Line Items]
Amount of gain (loss) recognized on derivative in Other Comprehensive Income	(1,234,000)	$ 444,000	(1,978,000)	$ 1,576,000
Amount of gain (loss) reclassified from Accumulated Other Comprehensive Income into Interest expense	108,000	46,000	226,000	46,000
Total amount of Interest expense presented in the Consolidated Statement of Operations	9,739,000	$ 8,786,000	18,508,000	$ 17,443,000
Other Assets
Derivative [Line Items]
Fair value of derivative financial instrument asset	225,000		225,000		$ 3,793,000
Accounts payable and accrued liabilities
Derivative [Line Items]
Fair value of derivative financial instrument liability	13,000		13,000		$ 0
Hedging instrument | Interest Rate Swap, Maturity Date April 1, 2022
Derivative [Line Items]
Current Notional Amount	$ 1,234,000		$ 1,234,000
Fixed Rate	5.25%		5.25%
Hedging instrument | Interest Rate Swap, Maturity Date May 6, 2023
Derivative [Line Items]
Current Notional Amount	$ 25,794,000		$ 25,794,000
Fixed Rate	3.61%		3.61%
Hedging instrument | Interest Rate Swap, Maturity Date September 19, 2026
Derivative [Line Items]
Current Notional Amount	$ 27,000,000		$ 27,000,000
Fixed Rate	4.05%		4.05%
Not Designated as Hedging Instrument | Interest rate caps
Derivative [Line Items]
Current Notional Amount	$ 38,200,000		$ 38,200,000
Value of derivative	$ 0		$ 0