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Commercial Mortgage and Subordinate Loans, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 4,067,494	$ 3,679,758
% of Portfolio	100.00%	100.00%
Urban Retail Predevelopment [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 710,992	$ 654,736
% of Portfolio	17.50%	17.80%
Residential-for Sale [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 704,020	$ 442,177
% of Portfolio	17.30%	12.00%
Hotel [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 654,631	$ 645,056
% of Portfolio	16.10%	17.60%
Office [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 584,990	$ 513,830
% of Portfolio	14.40%	14.00%
Residential Rental [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 467,605	$ 465,057
% of Portfolio	11.50%	12.60%
Mixed Use [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 356,079	$ 354,640
% of Portfolio	8.70%	9.60%
Retail Center [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 199,463	$ 198,913
% of Portfolio	4.90%	5.40%
Healthcare [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 158,292	$ 173,870
% of Portfolio	3.90%	4.70%
Other Property [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 154,084	$ 154,141
% of Portfolio	3.80%	4.20%
Industrial [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 77,338	$ 77,338
% of Portfolio	1.90%	2.10%
Manhattan, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 1,209,678	$ 1,173,833
% of Portfolio	29.70%	31.90%
Brooklyn, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 358,425	$ 357,611
% of Portfolio	8.80%	9.70%
Northeast [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 107,671	$ 100,536
% of Portfolio	2.70%	2.70%
Midwest [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 737,780	$ 683,380
% of Portfolio	18.10%	18.60%
Southeast [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 447,450	$ 531,582
% of Portfolio	11.00%	14.40%
West [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 270,170	$ 227,024
% of Portfolio	6.60%	6.20%
Mid Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 182,320	$ 191,976
% of Portfolio	4.50%	5.20%
Southwest [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 33,384	$ 33,615
% of Portfolio	0.80%	0.90%
UNITED KINGDOM
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 645,338	$ 303,488
% of Portfolio	15.90%	8.30%
Other International [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 75,278	$ 76,713
% of Portfolio	1.90%	2.10%

X

- Definition

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

+ References

No definition available.

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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://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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- 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.

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