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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Statistics for Loan Portfolio (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan
Loans and Leases Receivable Disclosure [Line Items] |  |
Number of loans | loan | 72 | 69
Carrying value | $ 6,375,093 | $ 4,927,593
Unfunded loan commitments | $ 1,952,887 | $ 1,095,598
Weighted-average cash coupon | 6.50% | 8.40%
Weighted-average remaining term | 3 years 3 months 18 days | 2 years 9 months 18 days
Weighted-average expected maturity | 1 year 9 months 18 days | 1 year 10 months 24 days
Mortgage loans |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Principal balance | $ 6,467,842 | $ 4,982,514

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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=119400593&loc=d3e572229-122910 + Details
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- Definition Amount, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447 + Details
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