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Commercial Mortgage and Subordinate Loans, Net - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended | 15 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) $ / ft² | Jun. 30, 2018 USD ($) loan | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) $ / ft² | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of loan portfolio |  |  |  |  | 100.00% |  | 100.00% |  |  |
Provision for loan losses and impairment | $ 0 |  | $ 0 |  | $ 5,000 | $ 5,000 |  |  |  |
Carrying value | 4,828,046 |  |  |  | 4,828,046 |  | $ 3,679,758 |  |  |
Payment in kind interest | 10,200 |  | 5,300 |  | 29,900 | 19,300 |  |  |  |
Proceeds from pre-payment penalties or accelerated fees | 200 |  | $ 3,600 |  | 1,800 | $ 4,000 |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  | 5,000 |  |  |  |  |
Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  | 17,000 |  | 17,000 |  |  |
Carrying value | 3,723,550 |  |  |  | 3,723,550 |  | 2,653,826 |  |  |
Subordinate Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  | 5,000 |  | 5,000 |  |  |
Carrying value | 1,104,496 |  |  |  | 1,104,496 |  | $ 1,025,932 |  |  |
Residential Condominium - Bethesda, MD [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Loan loss provision and impairment |  |  |  |  |  |  |  |  | $ 10,000 |
Provision for loan losses and impairment |  | $ 5,000 |  | $ 2,000 |  |  |  |  |  |
Multifamily - Williston, ND [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  |  |  |  | $ 10,000 |  |
Multifamily - Williston, ND [Member] | Subordinate Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  |  |  |  | $ 5,000 |  |
Office Campus - Renton, WA [Member] | Subordinate Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of loan | 75,000 |  |  |  |  |  |  |  |  |
Proceeds from sale of loan, amount funded | 17,700 |  |  |  |  |  |  |  |  |
Carrying value | 265,000 |  |  |  | 265,000 |  |  |  |  |
Exposure to mortgage loan | 190,000 |  |  |  | 190,000 |  |  |  |  |
Exposure to mortgage loan, amount funded | $ 65,500 |  |  |  | 65,500 |  |  |  |  |
Other Assets [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment |  |  |  | $ 3,000 | $ 3,000 |  |  |  |  |
Floating Rate Loan [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of loan portfolio |  |  |  |  | 90.00% |  | 88.00% |  |  |
Dollars per square foot [Member] | Residential Condominium - Bethesda, MD [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Loan collateral, measurement input | $ / ft² | 662 |  |  |  | 662 |  |  |  |  |
Discount rate [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Loan collateral, measurement input |  |  |  |  |  |  |  | 0.10 |  |
Discount rate [Member] | Residential Condominium - Bethesda, MD [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Loan collateral, measurement input | 0.15 |  |  |  | 0.15 |  |  |  |  |
Terminal capitalization rate [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Loan collateral, measurement input |  |  |  |  |  |  |  | 0.11 |  |
Contractual Interest Rate Reduction [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Number of loans restructured | loan |  | 1 |  |  |  |  |  |  |  |
Unpaid principal balance of loan restructured |  | $ 169,000 |  |  |  |  |  |  | $ 169,000 |
Contractual Interest Rate Reduction [Member] | London Interbank Offered Rate (LIBOR) [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 3.00% |  |  |  |  |  |  | 3.00% | 5.50%

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- Definition The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin. + References No definition available. + Details
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