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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Cost Recovery Loans (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Amortized cost |  |  | $ 373,538,000 | $ 136,300,000 |
Loan specific reserves |  |  | 175,000,000 | 56,981,000 |
Specific CECL Allowance |  |  | (118,019,000) | (13,000,000.0) |
Provision for loan losses and impairments, net | [1] |  | 125,600,000 | 20,000,000 | $ 20,000,000
Total carrying value, net |  |  | 6,496,977,000 | 6,375,093,000 |
Payment in kind interest |  |  | 46,700,000 | 54,600,000 | 43,500,000
Minimum |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing Receivable, Rent, Price Per Square Foot |  |  | $ 25 |  |
Minimum | Hotel | Discount Rate |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Loan collateral, measurement input |  |  | 0.085 |  |
Minimum | Hotel | Capitalization Rate |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Loan collateral, measurement input |  |  | 0.070 |  |
Minimum | Urban Predevelopment | Capitalization Rate |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Loan collateral, measurement input |  |  | 0.050 |  |
Maximum |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Financing Receivable, Rent, Price Per Square Foot |  |  | $ 225 |  |
Maximum | Urban Predevelopment | Capitalization Rate |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Loan collateral, measurement input |  |  | 0.055 |  |
Retail Center - Cincinnati, OH |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Specific CECL Allowance |  |  | $ (47,000,000.0) |  |
Payment in kind interest |  |  | $ 1,600,000 | 1,400,000 |
Retail Center - Cincinnati, OH | Capitalization Rate |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Loan collateral, measurement input |  |  | 0.083 |  |
Hotel - Pittsburgh, PA |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Amortized cost |  |  | $ 21,500,000 |  |
Specific CECL Allowance |  | $ (9,500,000) |  |  |
Total carrying value, net |  | $ 38,500,000 |  |  | $ 38,500,000
Hotel - Washington D.C. |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Payment in kind interest |  |  | 200,000 | $ 0 |
Mortgage, Amortized cost |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Amortized cost |  |  | 351,813,000 |  |
Mortgage, Amortized cost | Urban Predevelopment - Brooklyn, NY |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Amortized cost |  |  | 131,050,000 |  |
Mortgage, Amortized cost | Urban Predevelopment - Miami, FL |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Amortized cost |  |  | 115,419,000 |  |
Total carrying value, net |  |  | 180,500,000 |  |
Mortgage, Amortized cost | Retail Center - Cincinnati, OH |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Amortized cost |  |  | 105,344,000 |  |
Mezzanine, Amortized cost |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Amortized cost |  |  | 21,725,000 |  |
Mezzanine, Amortized cost | Hotel - Washington D.C. |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Amortized cost |  |  | $ 21,725,000 |  |
[1] | Comprised of $118,019 of Specific CECL Allowance, $10,600 of General CECL Allowance, and a $3,019 reversal of a previously recorded impairment on an equity investment for the year ended December 31, 2020, respectively. For the years ended December 31, 2019 and 2018 the balance represents provision per loan losses as determined by the authoritative guidance at the time.

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