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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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