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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Allocation of Carrying Value of Loan Portfolio Based on Internal Risk Ratings (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans | loan	72	69
Carrying value | $	$ 6,375,093	$ 4,927,593
% of Portfolio	100.00%	100.00%
Weighted-average risk rating	3.0	3.1
1
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans | loan	0	0
Carrying value | $	$ 0	$ 0
% of Portfolio	0.00%	0.00%
2
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans | loan	8	3
Carrying value | $	$ 348,324	$ 138,040
% of Portfolio	5.00%	3.00%
3
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans | loan	61	63
Carrying value | $	$ 5,707,555	$ 4,573,930
% of Portfolio	90.00%	93.00%
4
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans | loan	1	0
Carrying value | $	$ 182,910	$ 0
% of Portfolio	3.00%	0.00%
5
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans | loan	2	3
Carrying value | $	$ 136,304	$ 215,623
% of Portfolio	2.00%	4.00%

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Loans And Leases Receivable, Number Of Contracts

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Mortgage Loans on Real Estate, Commercial and Consumer, Percentage of Portfolio

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- Definition

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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