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Fair Value Measurements - Summary (Details)	Jun. 30, 2019 USD ($) Y item	Dec. 31, 2018 USD ($) Y
Recurring | Level 2 | Interest rate swap
Financial assets:
Derivative financial instruments	$ 126,000	$ 2,399,000
Financial liabilities:
Derivative financial instruments	2,327,000	505,000
Mortgages payable
FAIR VALUE MEASUREMENTS
Estimated fair value of mortgages payable	446,700,000	420,396,000
Carrying value of mortgage loans	438,503,000	423,096,000
Excess of fair value over carrying value	$ 8,197,000
Excess of carrying value over fair value		$ 2,700,000
Blended market interest rate | Mortgages payable
FAIR VALUE MEASUREMENTS
Long-term debt, measurement input	0.400	0.0441
Remaining term to maturity | Mortgages payable
FAIR VALUE MEASUREMENTS
Long-term debt, measurement input | Y	8.2	8.7

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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