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Schedule IV - Mortgage Loans on Real Estate (Details 2) $ in Thousands	3 Months Ended
	Dec. 31, 2017 USD ($)
Mortgage Loans on Real Estate [Line Items]
Aggregate cost of mortgage loans on real estate	$ 3,696,739
One Month LIBOR [Member]
Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	1.56%

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- Definition

Mortgage Loans on Real Estate, Basis Spread on Variable Rate

+ References

No definition available.

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- Definition

Amount of the federal income tax basis of mortgage loans on real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.8)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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