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Borrowings - Summary of Borrowings (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Total borrowings, net | $ 293,424 | $ 301,002
Mortgage notes and bonds payable |  |
Debt Instrument [Line Items] |  |
Total mortgage notes and bonds payable | 291,944 | 292,988
Debt issuance costs – mortgage notes and bonds payable | (2,020) | (1,986)
Total borrowings, net | 289,924 | 291,002
Notes payable to bank | Fixed-rate mortgage notes payable |  |
Debt Instrument [Line Items] |  |
Total mortgage notes and bonds payable | $ 206,393 | 208,469
Notes payable to bank | Fixed-rate mortgage notes payable | Minimum |  |
Debt Instrument [Line Items] |  |
Stated interest rate (as percent) | 3.16% |
Notes payable to bank | Fixed-rate mortgage notes payable | Maximum |  |
Debt Instrument [Line Items] |  |
Stated interest rate (as percent) | 4.99% |
Notes payable to bank | Fixed-rate mortgage notes payable | Weighted average |  |
Debt Instrument [Line Items] |  |
Stated interest rate (as percent) | 3.63% |
Bonds payable | Fixed-rate bonds payable |  |
Debt Instrument [Line Items] |  |
Total mortgage notes and bonds payable | $ 85,551 | 84,519
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) | 4.47% |
Bonds payable | Fixed-rate bonds payable | Weighted average |  |
Debt Instrument [Line Items] |  |
Stated interest rate (as percent) | 3.15% |
MetLife Lines of Credit | Variable-rate revolving lines of credit | Revolving credit facility |  |
Debt Instrument [Line Items] |  |
Total borrowings, net | $ 3,500 | $ 10,000
Stated interest rate (as percent) | 4.57% |

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