Real Estate Investments - Summary of Land Parcels Sold (Parenthetical) (Details) $ in Thousands		1 Months Ended	3 Months Ended
	Jan. 08, 2015 USD ($)	Jan. 31, 2019 USD ($) Installment	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Sale of undeveloped land			$ 5,273	$ 14,921
Land [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Sale of undeveloped land			5,273
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
Sale of undeveloped land	$ 250		$ 300