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Mortgage Notes Payable, Revolving Credit Facility, and Term Loan Facility - Interest Rate Cap (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Aggregate cost | $ 1,105 |
Notional amount | 134,678 | $ 143,512
Fair value asset | $ 622 | 504
Minimum | LIBOR |  |
Debt Instrument [Line Items] |  |
Interest rate (as percent) | 2.50% |
Maximum | LIBOR |  |
Debt Instrument [Line Items] |  |
Interest rate (as percent) | 3.25% |
Interest rate swaps | Counterparty |  |
Debt Instrument [Line Items] |  |
Notional amount | $ 24,732 | 11,036
Fair value asset | 451 | $ 316
Fair value liability | $ (396) |

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