Schedule-II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 19,865		$ 202
Additions Charged Against Operations	324		19,711
Uncollectible accounts Written-off	(19,596)		(48)
Balance at End of Year	593		19,865
Allowance for Doubtful Accounts [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	277		202
Additions Charged Against Operations	324		123
Uncollectible accounts Written-off	(8)		(48)
Balance at End of Year	593	[1]	277
Allowance for Preferred Equity Investments [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	19,588
Additions Charged Against Operations			19,588
Uncollectible accounts Written-off	$ (19,588)
Balance at End of Year			$ 19,588

[1] ^{Represents allowance for tenant receivables arising from operating leases. The allowance was written-off on January 1, 2019 upon the adoption of ASU 2016-02, an update to ASC Topic 842, Leases, which requires companies to account for impairment of receivables as reduction to “rental income” if the collectability of these receivables is not probable.}