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Commercial Mortgage and Subordinate Loans, Net - Statistics for Loan Portfolio (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2018 USD ($) loan | Dec. 31, 2017 USD ($) loan
Receivables [Abstract] |  |
Number of loans | loan | 68 | 59
Principal balance | $ 4,864,836 | $ 3,706,169
Carrying value | $ 4,828,046 | 3,679,758
Unfunded loan commitments |  | $ 435,627
Weighted-average cash coupon | 8.20% | 8.40%

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- Definition Mortgage Loans on Real Estate, Commitment to Lend, Unfunded Amount + References No definition available. + Details
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- Definition Amount before allowance of consumer real estate loans. Includes, but not limited to, construction financing, residential mortgage loans, and home equity lines of credit. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: 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(a)(2),(3),(b)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: 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 + Details
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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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