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LOANS - CRE Debt and Preferred Equity Investments - Based on Outstanding Principal (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Real Estate [Line Items] |  |  |  |
Beginning balance | [1],[2] | $ 4,585,975 |  |
Principal payments |  | (264,069) |  |
Ending balance | [2] | 3,546,468 | $ 4,585,975 | [1]
Commercial Mortgage |  |  |  |
Real Estate [Line Items] |  |  |  |
Beginning balance |  | 1,296,803 | 1,029,327 |
Originations & advances (principal) |  | 1,069,788 | 628,177 |
Principal payments |  | (107,881) | (353,424) |
Transfers |  | (839,904) |  |
Net (increase) decrease in origination fees |  | (2,508) | (6,994) |
Amortization of net origination fees |  | 3,010 | 3,213 |
Allowance for loan losses |  | (5,703) | (3,496) |
Ending balance |  | 1,413,605 | 1,296,803 |
Commercial Mortgage | Senior mortgages |  |  |  |
Real Estate [Line Items] |  |  |  |
Beginning balance |  | 981,202 | 625,900 |
Originations & advances (principal) |  | 210,551 | 575,953 |
Principal payments |  | (15,663) | (216,849) |
Transfers |  | (831,229) |  |
Net (increase) decrease in origination fees |  | 4,240 | (6,624) |
Amortization of net origination fees |  | 1,297 | 2,822 |
Allowance for loan losses |  | 0 | 0 |
Ending balance |  | 350,398 | 981,202 |
Commercial Mortgage | Senior Securitized Mortgages |  |  |  |
Real Estate [Line Items] |  |  |  |
Beginning balance |  | 0 |  |
Originations & advances (principal) |  | 840,052 |  |
Principal payments |  | (45,000) |  |
Transfers |  | 0 |  |
Net (increase) decrease in origination fees |  | (6,564) |  |
Amortization of net origination fees |  | 1,412 |  |
Allowance for loan losses |  | 0 |  |
Ending balance |  | 789,900 | 0 |
Commercial Mortgage | Preferred equity |  |  |  |
Real Estate [Line Items] |  |  |  |
Beginning balance |  | 0 | 8,985 |
Originations & advances (principal) |  |  | 0 |
Principal payments |  |  | (9,000) |
Net (increase) decrease in origination fees |  |  | 0 |
Amortization of net origination fees |  |  | 15 |
Allowance for loan losses |  |  | 0 |
Ending balance |  |  | 0 |
Mezzanine loans | Commercial Mortgage |  |  |  |
Real Estate [Line Items] |  |  |  |
Beginning balance |  | 315,601 | 394,442 |
Originations & advances (principal) |  | 19,185 | 52,224 |
Principal payments |  | (47,218) | (127,575) |
Transfers |  | (8,675) |  |
Net (increase) decrease in origination fees |  | (184) | (370) |
Amortization of net origination fees |  | 301 | 376 |
Allowance for loan losses |  | (5,703) | (3,496) |
Ending balance |  | $ 273,307 | $ 315,601 |
[1] | (1) Derived from the audited consolidated financial statements at December 31, 2018.
[2] | (4) Includes $119.7 million and $97.5 million of residential mortgage loans held for sale, $41.9 million and $42.2 million of commercial mortgage loans held for sale and $26.9 million and $0 of corporate loans held for sale at June 30, 2019 and December 31, 2018, respectively.

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