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Schedule IV - Mortgage Loans on Real Estate (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan
Mortgage Loans on Real Estate [Line Items]
Number of loans | loan	59	45
Principal Balance	$ 3,706,169
Carrying Value	3,679,758	$ 2,693,092
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Commercial Mortgage Portfolio Segment [Member]
Mortgage Loans on Real Estate [Line Items]
Principal Balance	2,671,871
Carrying Value	2,653,826	1,641,856
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Subordinate Mortgage Portfolio Segment [Member]
Mortgage Loans on Real Estate [Line Items]
Principal Balance	1,034,298
Carrying Value	1,025,932	1,051,236
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Urban Retail Predevelopment [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	654,736	491,187
Urban Retail Predevelopment [Member] | Urban Retail Predevelopment, July 2019 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Principal Balance	220,000
Carrying Value	221,710
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Urban Retail Predevelopment [Member] | Urban Retail Predevelopment, September 2018 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Principal Balance	127,180
Carrying Value	128,133
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Office [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	513,830	255,031
Office [Member] | Office, January 2023 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Principal Balance	182,616
Carrying Value	180,851
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Office [Member] | Office, December 2022 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Principal Balance	122,651
Carrying Value	120,199
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Retail Center [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	198,913	209,401
Retail Center [Member] | Retail, May 2020 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Principal Balance	167,340
Carrying Value	168,208
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Hotel [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	645,056	408,428
Hotel [Member] | Hotel, September 2020 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Principal Balance	138,406
Carrying Value	139,159
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Mixed Use [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	354,640	134,797
Mixed Use [Member] | Mixed Use, October 2020 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Principal Balance	132,184
Carrying Value	131,672
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Mixed Use [Member] | Mixed Use, June 2019 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Principal Balance	125,000
Carrying Value	124,256
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	$ 0
Hotel, Mixed Use, Office, Other, Residential-for Rent, Residential-for sale, Retail Center, Urban Retail Predevelopment [Member] | Hotel, Mixed Use, Office, Other, Residential-for Rent, Residential-for Sale, Retail Center, Urbain Retail Predevelopment, 2018 - 2022 [Member] | Commercial Mortgage Portfolio Segment, Loans Less Than 3% Of The Carrying Amount Of Total Senior Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Number of loans | loan	27
Principal Balance	$ 1,456,494
Carrying Value	1,439,637
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Residential-for Sale [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	442,179	469,997
Residential-for Sale [Member] | Residential-for Sale, July 2020 | Subordinate Mortgage Portfolio Segment, Loans In Excess Of 3% Of Carrying Amount Of Total Subordinate Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Principal Balance	115,490
Carrying Value	115,776
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Healthcare [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	173,870	$ 170,549
Healthcare [Member] | Health Care, 2021 [Member] | Subordinate Mortgage Portfolio Segment, Loans In Excess Of 3% Of Carrying Amount Of Total Subordinate Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Principal Balance	129,305
Carrying Value	128,785
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	$ 0
Healthcare, Hotel, Industrial, Mixed Use, Office, Other, Residential-for Rent, Residential-for Sale [Member] | Healthcare, Hotel, Industrial, Mixed Use, Office, Other, Residential-for Rent, Residential-for Sale 2018 - 2027 [Member] | Subordinate Mortgage Portfolio Segment, Loans Less Than 3% Of The Carrying Amount Of Total Subordinate Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Number of loans | loan	22
Principal Balance	$ 789,503
Carrying Value	781,372
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	$ 0
London Interbank Offered Rate (LIBOR) [Member]
Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	1.56%	0.77%
London Interbank Offered Rate (LIBOR) [Member] | Urban Retail Predevelopment [Member] | Urban Retail Predevelopment, July 2019 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	7.80%
London Interbank Offered Rate (LIBOR) [Member] | Urban Retail Predevelopment [Member] | Urban Retail Predevelopment, September 2018 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	8.60%
London Interbank Offered Rate (LIBOR) [Member] | Office [Member] | Office, January 2023 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	6.30%
London Interbank Offered Rate (LIBOR) [Member] | Office [Member] | Office, December 2022 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	6.90%
London Interbank Offered Rate (LIBOR) [Member] | Retail Center [Member] | Retail, May 2020 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	7.10%
London Interbank Offered Rate (LIBOR) [Member] | Hotel [Member] | Hotel, September 2020 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	6.80%
London Interbank Offered Rate (LIBOR) [Member] | Mixed Use [Member] | Mixed Use, October 2020 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	7.10%
London Interbank Offered Rate (LIBOR) [Member] | Mixed Use [Member] | Mixed Use, June 2019 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	6.00%
London Interbank Offered Rate (LIBOR) [Member] | Residential-for Sale [Member] | Residential-for Sale, July 2020 | Subordinate Mortgage Portfolio Segment, Loans In Excess Of 3% Of Carrying Amount Of Total Subordinate Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	15.80%
London Interbank Offered Rate (LIBOR) [Member] | Healthcare [Member] | Health Care, 2021 [Member] | Subordinate Mortgage Portfolio Segment, Loans In Excess Of 3% Of Carrying Amount Of Total Subordinate Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	11.60%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Hotel, Mixed Use, Office, Other, Residential-for Rent, Residential-for sale, Retail Center, Urban Retail Predevelopment [Member] | Hotel, Mixed Use, Office, Other, Residential-for Rent, Residential-for Sale, Retail Center, Urbain Retail Predevelopment, 2018 - 2022 [Member] | Commercial Mortgage Portfolio Segment, Loans Less Than 3% Of The Carrying Amount Of Total Senior Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	6.06%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Healthcare, Hotel, Industrial, Mixed Use, Office, Other, Residential-for Rent, Residential-for Sale [Member] | Healthcare, Hotel, Industrial, Mixed Use, Office, Other, Residential-for Rent, Residential-for Sale 2018 - 2027 [Member] | Subordinate Mortgage Portfolio Segment, Loans Less Than 3% Of The Carrying Amount Of Total Subordinate Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	6.81%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Hotel, Mixed Use, Office, Other, Residential-for Rent, Residential-for sale, Retail Center, Urban Retail Predevelopment [Member] | Hotel, Mixed Use, Office, Other, Residential-for Rent, Residential-for Sale, Retail Center, Urbain Retail Predevelopment, 2018 - 2022 [Member] | Commercial Mortgage Portfolio Segment, Loans Less Than 3% Of The Carrying Amount Of Total Senior Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	8.31%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Healthcare, Hotel, Industrial, Mixed Use, Office, Other, Residential-for Rent, Residential-for Sale [Member] | Healthcare, Hotel, Industrial, Mixed Use, Office, Other, Residential-for Rent, Residential-for Sale 2018 - 2027 [Member] | Subordinate Mortgage Portfolio Segment, Loans Less Than 3% Of The Carrying Amount Of Total Subordinate Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	19.06%

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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Amount of principal due on loans that have been delinquent, which may exclude loans having interest delinquent for three months or less, as of the balance sheet date.

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