Other Commitments And Contingencies (Details)		9 Months Ended
	Oct. 20, 2011 USD ($)	Sep. 30, 2016 USD ($) mortgagenotes developmentproject
Commitment to fund project development		$ 284,400,000
Number of Surety Bonds		3
Surety bonds		$ 21,700,000
Number of Mortgage Notes Receivable (in mortgage notes) | mortgagenotes		5
Mortgage notes receivable with commitments		$ 16,700,000
Guarantor Obligations, Maximum Exposure, Undiscounted		$ 24,900,000
Loss Contingency, Damages Sought, Value	$ 800,000,000
Theatre Properties [Member]
Development projects in process (in projects) | developmentproject		20
Commitment to fund project development		$ 91,700,000
recreationproperties [Member]
Development projects in process (in projects) | developmentproject		6
Commitment to fund project development		$ 66,800,000
Concord Resort [Member]
Commitment to fund project development		120,000,000
Adelaar Infrastructure [Member]
Special Assessment Bond		110,000,000
Property under development		43,400,000
Anticipated reimbursement received from payment of economic development revenue bonds		$ 44,900,000
Education Property Member
Development projects in process (in projects) | developmentproject		17
Commitment to fund project development		$ 125,900,000
Louisiana Theatre Properties [Member]
Development projects in process (in projects) | developmentproject		2
Economic development revenue bond term		30 years
Deferred assets related to guarantee		$ 10,600,000
Deferred liabilities related to guarantee		10,600,000
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%