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Other Commitments And Contingencies (Details)		1 Months Ended						6 Months Ended	12 Months Ended
	Oct. 20, 2011 USD ($) claim	Aug. 31, 2018 USD ($)	Jul. 31, 2018 USD ($)	Jun. 30, 2018 USD ($) properties mortgagenotes developmentproject	May 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2018 USD ($) properties mortgagenotes developmentproject	Dec. 31, 2017 USD ($) properties	Dec. 31, 2016 USD ($)
Litigation Settlement, Expense								$ 90,000
Loss Contingency, Claims Settled and Dismissed, Number | claim	2
Commitment to fund project development				$ 110,800,000				$ 110,800,000
Number of Surety Bonds				6				6
Surety bonds				$ 22,800,000				$ 22,800,000
Number of Mortgage Notes Receivable (in mortgage notes) | mortgagenotes				5				5
Mortgage notes receivable with commitments								$ 18,600,000
Guarantor Obligations, Maximum Exposure, Undiscounted				$ 24,700,000				24,700,000
Loss Contingency, Damages Sought, Value	$ 800,000,000
Litigation Settlement, Amount Awarded to Other Party								$ 2,000,000
Loss Contingency, New Claims Filed, Number | claim	3
Theatre Properties [Member]
Development projects in process (in projects) | developmentproject				12				12
Commitment to fund project development				$ 24,700,000				$ 24,700,000
recreationproperties [Member]
Development projects in process (in projects) | developmentproject				5				5
Commitment to fund project development				$ 52,200,000				$ 52,200,000
Concord Resort [Member]
Commitment to fund project development				201,200,000				201,200,000
Adelaar Infrastructure [Member]
Special Assessment Bond				$ 110,000,000				110,000,000
Property under development								$ 6,900,000	$ 23,900,000	$ 43,400,000
Education Property Member
Development projects in process (in projects) | developmentproject				7				7
Commitment to fund project development				$ 33,900,000				$ 33,900,000
Louisiana Theatre Properties [Member]
Economic Development Revenue Bond Term								30 years
Development projects in process (in projects) | developmentproject				2				2
Economic development revenue bond annual fees percentage								4.00%
Deferred assets related to guarantee				$ 13,300,000				$ 13,300,000
Deferred liabilities related to guarantee				13,300,000				13,300,000
Loss contingency								0
Waterpark Hotel and Adventure Park [Member] | Kiamesha Lake NY [Member]
Commitment to fund project development				$ 86,100,000				$ 86,100,000
Children's Learning Adventure USA, LLC [Member]
Subsidiaries filing for bankruptcy | properties									10
Bankruptcy Claims, Number Claims Filed | properties									24
Number of Real Estate Properties | properties				25				25
Property Subject to or Available for Operating Lease, Number of Units | properties				21				21
Payments for Rent				$ 1,000,000	$ 750,000	$ 750,000	$ 750,000
Children's Learning Adventure USA, LLC [Member] | land held for development [Member]
number of properties under construction | properties									2
number of properties in land held for development | properties				4				4	1
Subsequent Event [Member] | Children's Learning Adventure USA, LLC [Member]
Payments for Rent		$ 1,000,000	$ 1,000,000

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