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Real Estate Investments - Mortgage Loans - Early Payoffs (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($) loan
Early mortgage loan payoffs |  |
Early Principal Payoff | $ 1,086 | $ 16,665
AZ/MI/PA/TX/VA | Mortgage Loans |  |
Early mortgage loan payoffs |  |
Early Principal Payoff |  | $ 10,795
Number of Loans | loan |  | 4
UT | Mortgage Loans |  |
Early mortgage loan payoffs |  |
Early Principal Payoff | $ 1,086 |
Number of Loans | loan | 1 |

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- Definition Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Footnote 3 -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 3)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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