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Commercial Mortgage and Subordinate Loans, Net - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) $ / ft² | Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2019 USD ($) $ / ft² | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2016 USD ($) | Mar. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Percentage of loan portfolio |  |  |  |  | 100.00% |  | 100.00% |  |
(Reversal of) Provision for loan losses and impairments | $ (15,000) |  | $ 5,000 |  | $ (15,000) | $ 5,000 |  |  |
Carrying value | 5,443,744 | $ 4,927,593 |  |  | 5,443,744 |  | $ 4,927,593 |  |
Payment in kind interest | 14,600 |  | 9,100 |  | 29,100 | 19,700 |  |  |
Proceeds from pre-payment penalties or accelerated fees | 0 |  | 1,600 |  | 3,700 | $ 1,600 |  |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
(Reversal of) Provision for loan losses and impairments | (15,000) |  |  |  | (15,000) |  |  |  |
Amortized cost of the loan | 5,443,744 | 4,927,593 |  |  | 5,443,744 |  | 4,927,593 |  |
Loan loss provision and impairment |  |  |  |  | 22,000 |  | 37,000 |  |
Loss on sale of underlying collateral | 12,500 |  |  |  | 12,513 |  |  |  |
Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Carrying value | 4,206,754 | 3,878,981 |  |  | 4,206,754 |  | 3,878,981 |  |
Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Carrying value | 1,236,990 | 1,048,612 |  |  | 1,236,990 |  | 1,048,612 |  |
Retail Center - Cincinnati, OH | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
(Reversal of) Provision for loan losses and impairments |  | 15,000 |  |  |  |  |  |  |
Amortized cost of the loan | 158,100 | 156,100 |  |  | 158,100 |  | 156,100 |  |
Residential Condominium - Bethesda, MD | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
(Reversal of) Provision for loan losses and impairments |  |  | $ 5,000 | $ 2,000 |  |  |  |  |
Amortized cost of the loan | 21,500 | 27,200 |  |  | 21,500 |  | 27,200 |  |
Loan loss provision and impairment |  |  |  |  | 10,000 |  |  |  |
Impairment |  |  |  | $ 3,000 |  |  |  |  |
Multifamily - Williston, ND | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Amortized cost of the loan |  | 32,400 |  |  |  |  | 32,400 |  |
Multifamily - Williston, ND | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
(Reversal of) Provision for loan losses and impairments |  |  |  |  |  |  |  | $ 10,000 |
Multifamily - Williston, ND | Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
(Reversal of) Provision for loan losses and impairments |  |  |  |  |  |  |  | $ 5,000 |
Office Campus - Renton, WA | Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [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 | $ 108,000 |  |  |  | $ 108,000 |  |  |  |
Floating Rate Loan |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Percentage of loan portfolio |  |  |  |  | 93.00% |  | 91.00% |  |
Net operating income | Retail Center - Cincinnati, OH | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Loan collateral |  | $ 10,500 |  |  |  |  | $ 10,500 |  |
Capitalization rate | Retail Center - Cincinnati, OH | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Loan collateral, measurement input |  | 0.068 | 0.068 |  |  | 0.068 | 0.068 |  |
Dollars per square foot | Residential Condominium - Bethesda, MD | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Loan collateral, measurement input | $ / ft² | 662 |  |  |  | 662 |  |  |  |
Discount rate | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Loan collateral, measurement input |  |  |  |  |  |  |  | 0.10 |
Discount rate | Residential Condominium - Bethesda, MD | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Loan collateral, measurement input | 0.15 |  |  |  | 0.15 |  |  |  |
Terminal capitalization rate | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Loan collateral, measurement input |  |  |  |  |  |  |  | 0.11 |
Contractual Interest Rate Reduction | Retail Center - Cincinnati, OH | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Unpaid principal balance of loan restructured |  |  | $ 171,200 |  |  | $ 171,200 |  |  |
Contractual Interest Rate Reduction | London Interbank Offered Rate (LIBOR) | Retail Center - Cincinnati, OH | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 3.00% |  |  | 3.00% |  |  | 5.50%

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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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