Other Commitments And Contingencies (Details)	1 Months Ended	3 Months Ended		7 Months Ended	12 Months Ended
	Oct. 31, 2018 USD ($)	Mar. 31, 2019 USD ($) properties mortgagenotes developmentproject	Mar. 31, 2018 USD ($)	Mar. 31, 2019 USD ($) properties mortgagenotes developmentproject	Dec. 31, 2018 USD ($) properties
Long Term Funding Commitment For Project Development		$ 83,000,000		$ 83,000,000
Number of economic development bonds		2		$ 2
Noncash or Part Noncash Acquisition, Debt Assumed		$ 18,585,000	$ 0
Number of Surety Bonds		4		4
Surety bonds		$ 50,700,000		$ 50,700,000
Number of Mortgage Notes Receivable (in mortgage notes) | mortgagenotes		3		3
Mortgage notes receivable with commitments		$ 2,800,000
Tenant Reimbursements		$ 3,900,000	$ 4,000,000
Theatre Properties [Member]
Development projects in process (in projects) | developmentproject		7		7
Long Term Funding Commitment For Project Development		$ 23,700,000		$ 23,700,000
recreationproperties [Member]
Development projects in process (in projects) | developmentproject		5		5
Long Term Funding Commitment For Project Development		$ 38,300,000		$ 38,300,000
Concord Resort [Member]
Long Term Funding Commitment For Project Development		206,900,000		206,900,000
Kiamesha Lake NY [Member]
Reimbursement Revenue					$ 74,200,000
Adelaar Infrastructure [Member]
Special Assessment Bond		110,000,000		$ 110,000,000
Property under development		$ 11,500,000
Education Property Member
Development projects in process (in projects) | developmentproject		5		5
Long Term Funding Commitment For Project Development		$ 21,000,000		$ 21,000,000
Louisiana Theatre Properties [Member]
Economic Development Revenue Bond Term		30 years
Deferred assets related to guarantee					5,300,000
Gain (Loss) Related to Litigation Settlement		$ 0
Deferred liabilities related to guarantee		9,900,000		9,900,000	$ 16,100,000
Number of economic development bonds		1		1
Loss Contingency, Damages Paid, Value		6,200,000
Noncash or Part Noncash Acquisition, Debt Assumed		$ 18,600,000
Guarantor Obligations, Collateral Held Directly or by Third Parties		14.0
Waterpark Hotel and Adventure Park [Member] | Kiamesha Lake NY [Member]
Long Term Funding Commitment For Project Development		$ 178,800,000		$ 178,800,000
Children's Learning Adventure USA, LLC [Member]
Payments to Acquire Furniture and Fixtures		$ 3,500,000
Subsidiaries filing for bankruptcy | properties					10
Property Subject to or Available for Operating Lease, Number of Units | properties		21		21
Payments for Rent	$ 1,000,000			$ 1,000,000	$ 4,300,000
Tenant Reimbursements				170,000
Settlement Consideration		$ 15,000,000		$ 15,000,000
Triple net lease term		20		20
Mortgages [Member] | Louisiana Theatre Properties [Member]
Loans Receivable, Basis Spread on Variable Rate		15000.00%		15000.00%
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate		3.99%		3.99%