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Schedule IV - Mortgage Loans on Real Estate (Details 2) $ in Thousands | 3 Months Ended
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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 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 + Details
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