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LOANS - CRE Debt and Preferred Equity Investments - Based on Outstanding Principal (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Real Estate [Line Items] |  |  |  |
Beginning balance | [1],[2] | $ 4,585,975 |  |
Principal payments |  | (456,300) |  |
Ending balance | [2] | 3,946,614 | $ 4,585,975 | [1]
Commercial Mortgage |  |  |  |
Real Estate [Line Items] |  |  |  |
Beginning balance |  | 1,296,803 | 1,029,327 |
Originations & advances (principal) |  | 1,362,156 | 628,177 |
Principal payments |  | (306,104) | (353,424) |
Transfers |  | (922,524) |  |
Net (increase) decrease in origination fees |  | (4,211) | (6,994) |
Amortization of net origination fees |  | 4,521 | 3,213 |
Allowance for loan losses |  | (9,207) | (3,496) |
Ending balance |  | 1,421,434 | 1,296,803 |
Commercial Mortgage | Senior mortgages |  |  |  |
Real Estate [Line Items] |  |  |  |
Beginning balance |  | 981,202 | 625,900 |
Originations & advances (principal) |  | 376,651 | 575,953 |
Principal payments |  | (16,099) | (216,849) |
Transfers |  | (913,849) |  |
Net (increase) decrease in origination fees |  | 2,972 | (6,624) |
Amortization of net origination fees |  | 1,583 | 2,822 |
Allowance for loan losses |  | 0 | 0 |
Ending balance |  | 432,460 | 981,202 |
Commercial Mortgage | Senior Securitized Mortgages |  |  |  |
Real Estate [Line Items] |  |  |  |
Beginning balance |  | 0 |  |
Originations & advances (principal) |  | 964,473 |  |
Principal payments |  | (150,050) |  |
Transfers |  | 0 |  |
Net (increase) decrease in origination fees |  | (6,999) |  |
Amortization of net origination fees |  | 2,581 |  |
Allowance for loan losses |  | 0 |  |
Ending balance |  | 810,005 | 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 |
Commercial Mortgage | Mezzanine loans |  |  |  |
Real Estate [Line Items] |  |  |  |
Beginning balance |  | 315,601 | 394,442 |
Originations & advances (principal) |  | 21,032 | 52,224 |
Principal payments |  | (139,955) | (127,575) |
Transfers |  | (8,675) |  |
Net (increase) decrease in origination fees |  | (184) | (370) |
Amortization of net origination fees |  | 357 | 376 |
Allowance for loan losses |  | (9,207) | (3,496) |
Ending balance |  | $ 178,969 | $ 315,601 |
[1] | (1) Derived from the audited consolidated financial statements at December 31, 2018.
[2] | (4) Includes $76.3 million and $97.5 million of residential mortgage loans held for sale and $0 and $42.2 million of commercial mortgage loans held for sale at September 30, 2019 and December 31, 2018, respectively.

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