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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, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Aggregate Cost | $ 1,171 |
Aggregate Notional Amount | 143,512 | $ 71,721
Aggregate Fair Value | $ 504 | $ 101
Minimum | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Derivative, cap interest rate | 2.50% |
Maximum | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Derivative, cap interest rate | 3.00% |

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- Definition Fair value of all derivatives designated as interest rate fair value hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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