Unconsolidated Real Estate Joint Ventures (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) properties	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity in income from joint ventures	$ 489,000	$ 51,000
Proceeds from Equity Method Investment, Distribution	112,000	116,000
Investment In Unconsolidated Variable Interest Entities	190,700,000
Long Term Funding Commitment For Project Development	83,000,000
St. Petersburg Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Equity in income from joint ventures	494,000	0
Proceeds from Equity Method Investment, Distribution	$ 0
Equity Method Investment, Ownership Percentage	65.00%
Equity Method Investment, Partner's Ownership Percentage	35.00%
Number of unconsolidated real estate joint ventures | properties	2
Carrying Amount Joint Venture Mortgage Loan	$ 61,200,000		$ 60,000,000
Remaining Availability Joint Venture Mortgage Loan	23,800,000
Long Term Funding Commitment For Project Development	$ 14,600,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	6.00%
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	3.75%
Maximum Availability Joint Venture Mortgage Loan	$ 85,000,000
Theatre Project China Member
Schedule of Equity Method Investments [Line Items]
Equity in income from joint ventures	5,000	51,000
Proceeds from Equity Method Investment, Distribution	112,000	$ 116,000
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures	4,800,000		4,900,000
Recreation Reportable Operating Segment [Member] | Recreation Anchored Lodging [Member]
Schedule of Equity Method Investments [Line Items]
Investment In Unconsolidated Variable Interest Entities	$ 30,300,000		$ 29,500,000
Interest Rate Swap [Member] | St. Petersburg Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Derivative, Fixed Interest Rate	3.00%