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Commitments and Contingencies (Narrative) (Details)		9 Months Ended
	Apr. 21, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Jan. 22, 2015 a
Other Commitments [Line Items]
Percentage of capital committed to strategic investments that may be drawn down		100.00%
Net proceeds from sales of land and development assets		$ 174,979,000	$ 64,159,000
Lennar
Other Commitments [Line Items]
Area of land subject to litigation (in acres) | a				1,250
Lennar | Real Estate Sales
Other Commitments [Line Items]
Net proceeds from sales of land and development assets	$ 234,100,000
Payments for documentary transfer taxes	3,300,000
Sales proceeds from sale of land	114,000,000
Proceeds from interest received	121,800,000
Proceeds from real estate tax reimbursements	1,600,000
Damages sought for legal fees, in excess of	$ 17,000,000
Participation interests held by third party (as a percent)	4.30%
Lennar | Land & Development | Real Estate Sales
Other Commitments [Line Items]
Unpaid purchase price, interest rate (as a percent)				12.00%

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Land acreage subject to litigation.

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Loss Contingency, Participation Interests Held by Third Party, Percent

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Payments for Documentary Transfer Taxes

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Proceeds from Real Estate Tax Reimbursements

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Proceeds from Sale of Land

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Unpaid Purchase Price, Interest Rate

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

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Interest received on loans and other debt instruments during the current period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
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The cash inflow from the sale of land held for investment; excludes sales of land held as inventory or productive use.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
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