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