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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Statistics for Loan Portfolio (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan
Loans and Leases Receivable Disclosure [Line Items]
Number of loans | loan	74	69
Carrying value	$ 6,114,574	$ 4,927,593
Unfunded loan commitments	$ 1,073,423	$ 1,095,598
Weighted-average cash coupon	7.50%	8.40%
Weighted-average remaining term	3 years 1 month 6 days	2 years 9 months 18 days
Mortgage loans
Loans and Leases Receivable Disclosure [Line Items]
Principal balance	$ 6,192,473	$ 4,982,514

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Loans And Leases Receivable, Number Of Contracts

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Loans And Leases Receivable, Weighted Average Interest Rate

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Loans and Leases Receivable, Weighted Average Remaining Term

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Mortgage Loans on Real Estate, Commitment to Lend, Unfunded Amount

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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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The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(c))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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Amount, before allowance for credit loss, of financing receivable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447

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