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Schedule IV - Mortgage Loans on Real Estate (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) loan	Dec. 31, 2017 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal Balance	$ 4,982,514
Carrying value	4,927,593	$ 3,679,758
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Commercial Mortgage Portfolio Segment [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal Balance	3,928,234
Carrying value	3,878,981	2,653,826
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Subordinate Mortgage Portfolio Segment [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal Balance	1,054,280
Carrying value	1,048,612	1,025,932
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Urban Retail Predevelopment [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Carrying value	683,886	654,736
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]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal Balance	220,000
Carrying value	222,017
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Urban Retail Predevelopment [Member] | Urban Retail Predevelopment, March 2019 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal Balance	178,556
Carrying value	178,117
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Residential-for-sale: inventory [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Carrying value	577,053	92,438
Residential-for-sale: inventory [Member] | Residential-For-Sale, Inventory, March 2021 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal Balance	216,818
Carrying value	216,168
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Hotel [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Carrying value	1,286,590	645,056
Hotel [Member] | Hotel, January 2022 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal Balance	215,000
Carrying value	215,323
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Hotel [Member] | Hotel, April 2023 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal Balance	151,550
Carrying value	150,959
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Office [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Carrying value	832,620	513,830
Office [Member] | Office, October 2021 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal Balance	177,617
Carrying value	176,260
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Office [Member] | Office, January 2023 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal Balance	172,626
Carrying value	171,312
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Retail Center [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Carrying value	156,067	198,913
Retail Center [Member] | Retail Center, September 2020 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal Balance	169,035
Carrying value	156,067
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	$ 0
Hotel, Office, Multifamily, Residential-For-Sale: Inventory, Urban Retail Predevelopment, Residential-For-Sale: Construction, Other, Mixed Use [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]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of loans | loan	37
Principal Balance	$ 2,427,032
Carrying value	2,392,758
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	0
Residential-for Sale [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Carrying value		$ 442,200
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]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal Balance	181,572
Carrying value	182,895
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	$ 0
Residential-for Sale: Construction, Hotel, Multifamily, Other, Mixed Use, Residential-For-Sale: Inventory, Industrial, Office [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]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of loans | loan	23
Principal Balance	$ 872,708
Carrying value	865,717
Principal Amount of Mortgages Subject to Delinquent Principal or Interest	$ 0
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]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	8.80%
London Interbank Offered Rate (LIBOR) [Member] | Urban Retail Predevelopment [Member] | Urban Retail Predevelopment, March 2019 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	5.90%
London Interbank Offered Rate (LIBOR) [Member] | Residential-for-sale: inventory [Member] | Residential-For-Sale, Inventory, March 2021 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	7.20%
London Interbank Offered Rate (LIBOR) [Member] | Hotel [Member] | Hotel, January 2022 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	7.00%
London Interbank Offered Rate (LIBOR) [Member] | Hotel [Member] | Hotel, April 2023 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	5.80%
London Interbank Offered Rate (LIBOR) [Member] | Office [Member] | Office, October 2021 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	5.90%
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]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	7.30%
London Interbank Offered Rate (LIBOR) [Member] | Retail Center [Member] | Retail Center, September 2020 [Member] | Commercial Mortgage Portfolio Segment, Loans In Excess Of 3% Of The Carrying Amount Of Total Senior Loans [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	5.50%
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]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	16.80%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Hotel, Office, Multifamily, Residential-For-Sale: Inventory, Urban Retail Predevelopment, Residential-For-Sale: Construction, Other, Mixed Use [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]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	0.00%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Residential-for Sale: Construction, Hotel, Multifamily, Other, Mixed Use, Residential-For-Sale: Inventory, Industrial, Office [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]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	0.00%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Hotel, Office, Multifamily, Residential-For-Sale: Inventory, Urban Retail Predevelopment, Residential-For-Sale: Construction, Other, Mixed Use [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]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	9.80%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Residential-for Sale: Construction, Hotel, Multifamily, Other, Mixed Use, Residential-For-Sale: Inventory, Industrial, Office [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]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Basis spread on variable interest rate	20.00%

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