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Other Commitments And Contingencies (Details)			3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2014 claim	Oct. 20, 2011 USD ($) claim	Mar. 31, 2017 USD ($)	Jun. 30, 2017 USD ($) mortgagenotes developmentproject	Dec. 31, 2016 USD ($)
Loss Contingency, Claims Settled and Dismissed, Number | claim	2	2
Commitment to fund project development				$ 175,700,000
Number of Surety Bonds				6
Surety bonds				$ 24,300,000
Number of Mortgage Notes Receivable (in mortgage notes) | mortgagenotes				8
Mortgage notes receivable with commitments				$ 11,700,000
Guarantor Obligations, Maximum Exposure, Undiscounted				$ 24,900,000
Loss Contingency, Damages Sought, Value		$ 800,000,000
Loss Contingency, Claims Dismissed, Number | claim	1
Loss Contingency, New Claims Filed, Number | claim		3
Theatre Properties [Member]
Development projects in process (in projects) | developmentproject				17
Commitment to fund project development				$ 65,500,000
recreationproperties [Member]
Development projects in process (in projects) | developmentproject				5
Commitment to fund project development				$ 54,700,000
Concord Resort [Member]
Commitment to fund project development				155,000,000
Adelaar Infrastructure [Member]
Special Assessment Bond				110,000,000
Property under development			$ 11,700,000		$ 43,400,000
Anticipated reimbursement received from payment of economic development revenue bonds				$ 33,200,000
Education Property Member
Development projects in process (in projects) | developmentproject				16
Commitment to fund project development				$ 55,500,000
Louisiana Theatre Properties [Member]
Development projects in process (in projects) | developmentproject				2
Economic development revenue bond term				30 years
Deferred assets related to guarantee				$ 10,500,000
Deferred liabilities related to guarantee				10,500,000
Loss contingency				$ 0
Minimum [Member] | Louisiana Theatre Properties [Member]
Economic development revenue bond annual fees percentage				2.88%
Maximum [Member] | Louisiana Theatre Properties [Member]
Economic development revenue bond annual fees percentage				4.00%
Waterpark Hotel and Adventure Park [Member] | Kiamesha Lake NY [Member]
Commitment to fund project development				$ 5,000,000

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