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Schedule IV - Mortgage Loans On Real Estate - Rollforward of mortgage loans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |
Balance at beginning of period | $ 3,890,751 | $ 4,331,450 | $ 3,861,851
Additions during period: |  |  |
Originations/acquisitions | 5,741,427 | 4,983,049 | 11,115,486
Net discount accretion | 0 | 330 | 747
Deductions during period: |  |  |
Sales | (3,982,683) | (4,509,644) | (10,071,061)
Principal repayments | (576,620) | (879,188) | (582,187)
Reversal of provision for loan losses | 0 | 7,102 | 355
Transfers to REO | (4,219) | (11,566) | (5,792)
Deconsolidation adjustments | 0 | (6,871) | 0
Changes in fair value, net | 46,554 | (23,911) | 12,051
Balance at end of period | 5,115,210 | 3,890,751 | 4,331,450
Previously Reported |  |  |
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |
Balance at beginning of period | 3,890,751 | 4,331,450 | 3,965,500
Deductions during period: |  |  |
Balance at end of period |  | 3,890,751 | 4,331,450
ASU 2014-13 election adjustment |  |  |
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |
Balance at beginning of period | $ 0 | 0 | (103,649)
Deductions during period: |  |  |
Balance at end of period |  | $ 0 | $ 0

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- Definition Total carrying amount of mortgage loans as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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