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Participations Sold (Details) £ in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2015 USD ($) facility | Mar. 31, 2016 USD ($) | Mar. 31, 2016 GBP (£) | Dec. 31, 2015 USD ($) | Feb. 28, 2015 USD ($) | Feb. 28, 2015 GBP (£) | Jan. 31, 2015 GBP (£) | Aug. 31, 2014 USD ($) | Jun. 30, 2014 USD ($) | May. 31, 2014 USD ($)
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Carrying amount of mortgage loan |  | $ 116,952 |  | $ 118,201 |  |  |  |  |  |
Commercial mortgage loans [Member] |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Mortgage loan, face amount |  | 1,232,287 |  | 1,037,940 |  |  |  |  |  |
Commercial mortgage loans [Member] | Mezzanine Loan, Acquired by Investment Funds [Member] |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Mortgage loan, face amount |  | 28,432 | £ 19,799 |  | $ 30,672 | £ 20,000 |  |  |  |
Carrying amount of mortgage loan |  | 28,432 | £ 19,799 |  |  |  |  |  |  |
Subordinate loans [Member] |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Mortgage loan, face amount |  | 966,164 |  | $ 964,955 |  |  |  |  |  |
Hotel [Member] | Hotel - Aruba [Member] | Subordinate loans [Member] | First Mortgage [Member] |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Mortgage loan, face amount |  |  |  |  |  |  |  |  |  | $ 155,000
Senior Participation [Member] | Hotel [Member] | Hotel - Aruba [Member] | Subordinate loans [Member] |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Participation in loan, amount |  |  |  |  |  |  |  | $ 90,000 | $ 90,000 |
Junior Participation [Member] | Hotel [Member] | Hotel - Aruba [Member] | Subordinate loans [Member] |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Participation in loan, amount |  |  |  |  |  |  |  | $ 65,000 | $ 65,000 |
Participating Mortgages [Member] | Subordinate loans [Member] |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Mortgage loan, face amount |  | 88,548 |  |  |  |  |  |  |  |
Carrying amount of mortgage loan |  | $ 88,520 |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Commercial mortgage loans [Member] | Mezzanine Loan, Acquired by Investment Funds [Member] |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Basis point |  | 8.25% |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Participating Mortgages [Member] | Subordinate loans [Member] |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Basis point |  | 4.40% |  |  |  |  |  |  |  |
United Kingdom [Member] | Senior Housing Facility [Member] | Commercial mortgage loans [Member] | Mezzanine Loan [Member] |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |
Mortgage loan, face amount | $ 51,996 |  |  |  |  |  | £ 34,519 |  |  |
Number of properties | facility | 44 |  |  |  |  |  |  |  |  |

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