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Borrowings - Summary of Borrowings (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Total borrowings, net | $ 295,334 | $ 207,347
Mortgage notes and bonds payable |  |
Debt Instrument [Line Items] |  |
Total mortgage notes and bonds payable | 292,136 | 192,209
Deferred financing costs – mortgage notes and bonds payable | (1,902) | (1,412)
Total borrowings, net | 290,234 | 190,797
Notes payable to bank | Fixed-rate mortgage notes payable |  |
Debt Instrument [Line Items] |  |
Total mortgage notes and bonds payable | $ 207,618 | 142,861
Notes payable to bank | Fixed-rate mortgage notes payable | Minimum |  |
Debt Instrument [Line Items] |  |
Stated interest rate (as percent) | 2.90% |
Notes payable to bank | Fixed-rate mortgage notes payable | Maximum |  |
Debt Instrument [Line Items] |  |
Stated interest rate (as percent) | 4.47% |
Notes payable to bank | Fixed-rate mortgage notes payable | Weighted average |  |
Debt Instrument [Line Items] |  |
Stated interest rate (as percent) | 3.59% |
Bonds payable | Fixed-rate bonds payable |  |
Debt Instrument [Line Items] |  |
Total mortgage notes and bonds payable | $ 84,518 | 49,348
Bonds payable | Fixed-rate bonds payable | Minimum |  |
Debt Instrument [Line Items] |  |
Stated interest rate (as percent) | 2.38% |
Bonds payable | Fixed-rate bonds payable | Maximum |  |
Debt Instrument [Line Items] |  |
Stated interest rate (as percent) | 4.05% |
Bonds payable | Fixed-rate bonds payable | Weighted average |  |
Debt Instrument [Line Items] |  |
Stated interest rate (as percent) | 3.13% |
MetLife Lines of Credit | Variable-rate revolving lines of credit | Revolving credit facility |  |
Debt Instrument [Line Items] |  |
Total borrowings, net | $ 5,100 | $ 16,550
Stated interest rate (as percent) | 3.55% |

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