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Real Estate Investments - Development and Improvement Projects (Details) - USD ($) | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Real estate investments |  |
Invested in projects | $ 25,144,000 |
Developments | Development and Improvement Commitments |  |
Real estate investments |  |
Invested in projects | 18,623,000 | $ 9,155,000
Improvements | Development and Improvement Commitments |  |
Real estate investments |  |
Invested in projects | 1,763,000 | 2,195,000
ALF | Developments | Development and Improvement Commitments |  |
Real estate investments |  |
Invested in projects | 14,653,000 | 7,198,000
ALF | Improvements | Development and Improvement Commitments |  |
Real estate investments |  |
Invested in projects | 1,048,000 | 839,000
SNF | Developments | Development and Improvement Commitments |  |
Real estate investments |  |
Invested in projects | 3,970,000 | 1,957,000
SNF | Improvements | Development and Improvement Commitments |  |
Real estate investments |  |
Invested in projects | 500,000 | $ 1,356,000
Other | Improvements | Development and Improvement Commitments |  |
Real estate investments |  |
Invested in projects | $ 215,000 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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