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Commercial Mortgage and Subordinate Loans, Net - Allocation of Carrying Value of Loan Portfolio Based on Internal Risk Ratings (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | loan	69	69
Carrying value | $	$ 5,186,999	$ 4,927,593
% of Portfolio	100.00%	100.00%
Weighted-average risk rating	3.1	3.1
1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | loan	0	0
Carrying value | $	$ 0	$ 0
% of Portfolio	0.00%	0.00%
2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | loan	2	3
Carrying value | $	$ 58,847	$ 138,040
% of Portfolio	1.00%	3.00%
3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | loan	64	63
Carrying value | $	$ 4,915,843	$ 4,573,930
% of Portfolio	95.00%	93.00%
4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | loan	0	0
Carrying value | $	$ 0	$ 0
% of Portfolio	0.00%	0.00%
5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | loan	3	3
Carrying value | $	$ 212,309	$ 215,623
% of Portfolio	4.00%	4.00%

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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=6879938&loc=d3e572229-122910

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