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Schedule IV - Mortgage Loans on Real Estate - Summary of Changes in Carrying Amounts of Mortgage Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | $ 2,693,092 |  |  |  | $ 1,925,652 | $ 2,693,092 | $ 2,693,092 | $ 1,925,652 |
Loan fundings |  |  |  |  |  |  |  |  |  | 1,828,758 | 1,127,039 |
Loan repayments |  |  |  |  |  |  |  |  |  | (891,848) | (331,189) |
Participation sold |  |  |  |  |  |  |  |  |  | 0 | (24,051) |
Unrealized gain (loss) on foreign currency translation |  |  |  |  |  |  |  |  |  | 23,612 | (33,383) |
Discount accretion |  |  |  |  |  |  |  |  |  | 0 | 13,656 |
Provision for loan losses |  |  |  |  |  |  |  |  |  | (1,981) | (15,000) |
Deferred Fees |  |  |  |  |  |  |  |  |  | (27,424) | 0 |
PIK interest, amortization of fees and other items |  |  |  |  |  |  |  |  |  | 55,549 | 30,368 |
Balance at close of the year | $ 3,679,758 |  |  |  | $ 2,693,092 |  |  |  |  | 3,679,758 | 2,693,092 | $ 1,925,652
Provision for loan losses and impairment | $ 0 | $ 0 | $ 5,000 | $ 0 | $ 0 | $ 0 | $ 15,000 | $ 0 |  | 5,000 | 15,000 | $ 0
Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  |  |  |  |  |  | 11,981 | 10,000 |
Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  |  |  |  |  | 1,981 | 1,981 |  |
Subordinate Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  |  |  |  |  |  | 5,000 | $ 5,000 |
Other Assets [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Impairment |  |  |  |  |  |  |  |  |  | 3,019 |  |
Other Assets [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Impairment |  |  |  |  |  |  |  |  | $ 3,019 |  |  |
Affiliated Entity [Member] |  |  |  |  |  |  |  |  |  |  |  |
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Loan fundings |  |  |  |  |  |  |  |  |  | 50,000 |  |
Residential Condominium - Bethesda, MD [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  |  |  |  |  |  | $ 1,981 |  |

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- Definition Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30690-110894 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30700-110894 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 + Details
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