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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, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan
Mortgage Loans on Real Estate [Line Items]
Number of loans | loan	63	59
Carrying value | $	$ 4,067,494	$ 3,679,758
% of Portfolio	100.00%	100.00%
1 [Member]
Mortgage Loans on Real Estate [Line Items]
Number of loans | loan	0	0
Carrying value | $	$ 0	$ 0
% of Portfolio	0.00%	0.00%
2 [Member]
Mortgage Loans on Real Estate [Line Items]
Number of loans | loan	6	5
Carrying value | $	$ 395,212	$ 399,326
% of Portfolio	10.00%	10.00%
3 [Member]
Mortgage Loans on Real Estate [Line Items]
Number of loans | loan	54	51
Carrying value | $	$ 3,431,086	$ 3,034,358
% of Portfolio	84.00%	83.00%
4 [Member]
Mortgage Loans on Real Estate [Line Items]
Number of loans | loan	1	1
Carrying value | $	$ 168,677	$ 168,208
% of Portfolio	4.00%	5.00%
5 [Member]
Mortgage Loans on Real Estate [Line Items]
Number of loans | loan	2	2
Carrying value | $	$ 72,519	$ 77,866
% of Portfolio	2.00%	2.00%

X

- Definition

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

+ References

No definition available.

+ Details

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X

- 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://www.xbrl.org/2003/role/presentationRef
-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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X

- Definition

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.

+ References

No definition available.

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X

- Definition

Indicates the number of mortgages under each classification.

+ 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 210.12-29.3)
-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

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