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Commercial Mortgage and Subordinate Loans, Net - Additional Information (Details) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2019 USD ($) $ / ft² | Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2016 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Percentage of loan portfolio | 100.00% |  |  |  |  | 100.00% |
Carrying value | $ 5,186,999,000 | $ 4,927,593,000 |  |  |  | $ 4,927,593,000 |
Payment in kind interest | 14,500,000 |  |  | $ 10,600,000 |  |  |
Proceeds from pre-payment penalties or accelerated fees | 3,700,000 |  |  | $ 0 |  |  |
Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Loan loss provision and impairment | 37,000,000 |  |  |  |  | 37,000,000 |
Amortized cost of the loan | 5,186,999,000 | 4,927,593,000 |  |  |  | 4,927,593,000 |
Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Carrying value | 4,003,089,000 | 3,878,981,000 |  |  |  | 3,878,981,000 |
Subordinate Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Carrying value | 1,183,910,000 | 1,048,612,000 |  |  |  | 1,048,612,000 |
Retail Center - Cincinnati, OH [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Provision for loan losses and impairment |  | 15,000,000 |  |  |  |  |
Amortized cost of the loan | 156,000,000 | 156,000,000 |  |  |  | 156,000,000 |
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 | 10,000,000 |  |  |  |  |  |
Provision for loan losses and impairment |  |  | $ 5,000,000 |  | $ 2,000,000 |  |
Amortized cost of the loan | 24,200,000 | 27,200,000 |  |  |  | 27,200,000 |
Impairment |  |  |  |  | $ 3,000,000 |  |
Multifamily - Williston, ND [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Amortized cost of the loan | 32,100,000 | 32,400,000 |  |  |  | $ 32,400,000 |
Multifamily - Williston, ND [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  |  |  | $ 10,000,000
Multifamily - Williston, ND [Member] | Subordinate Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  |  |  | $ 5,000,000
Office Campus - Renton, WA [Member] | Subordinate Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Proceeds from sale of loan | 75,000,000 |  |  |  |  |  |
Proceeds from sale of loan, amount funded | 17,700,000 |  |  |  |  |  |
Carrying value | 265,000,000 |  |  |  |  |  |
Exposure to mortgage loan | 190,000,000 |  |  |  |  |  |
Exposure to mortgage loan, amount funded | $ 96,100,000 |  |  |  |  |  |
Floating Rate Loan [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Percentage of loan portfolio | 93.00% |  |  |  |  | 91.00% |
Net operating income [Member] | Retail Center - Cincinnati, OH [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Loan collateral |  | $ 10,500,000 |  |  |  | $ 10,500,000 |
Capitalization rate [Member] | Retail Center - Cincinnati, OH [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Loan collateral, measurement input |  |  | 0.068 |  |  |  |
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 |  |  |  |  |  |
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 |  |  |  |  |  |
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] | Retail Center - Cincinnati, OH [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Unpaid principal balance of loan restructured |  |  | $ 169,000,000 |  |  |  |
Contractual Interest Rate Reduction [Member] | London Interbank Offered Rate (LIBOR) [Member] | Retail Center - Cincinnati, OH [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 3.00% | 5.50% |  |  |

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- Definition Cash Flows between a transferor and a transferee attributable to newly transferred assets related to either a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109247956&loc=d3e107207-111719 + Details
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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=82891408&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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- 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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