Real Estate Investments - Summary of Land Parcels Sold (Parenthetical) (Details) $ in Thousands		1 Months Ended	6 Months Ended
	Jan. 08, 2015 USD ($)	Jan. 31, 2019 USD ($) Installment	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from the sale of properties			$ 5,523	$ 16,771
Land [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from the sale of properties			5,023
Libertyview [Member] | Land [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Contingent consideration to received		$ 1,000
Number of installments | Installment		12
Proceeds from the sale of properties	$ 0		$ 500