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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	9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | loan	68	59
Carrying value | $	$ 4,828,046	$ 3,679,758
% of Portfolio	100.00%	100.00%
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	5	5
Carrying value | $	$ 340,237	$ 399,326
% of Portfolio	7.00%	10.00%
3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | loan	60	51
Carrying value | $	$ 4,254,383	$ 3,034,358
% of Portfolio	88.00%	83.00%
4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | loan	1	1
Carrying value | $	$ 171,127	$ 168,208
% of Portfolio	4.00%	5.00%
5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | loan	2	2
Carrying value | $	$ 62,299	$ 77,866
% of Portfolio	1.00%	2.00%

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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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