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Mortgage Notes Payable, Revolving Credit Facility, and Term Loan Facility - Mortgage Notes Payable (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) property | Dec. 31, 2015 USD ($) property | Dec. 31, 2014 USD ($)
Debt Instrument [Line Items] |  |  |
Proceeds from debt issuance | $ 78,705 | $ 68,499 | $ 52,085
Weighted average interest rate on debt outstanding (as percent) | 4.48% |  |
Number of properties acquired | property | 3 | 6 |
Libor rate (as percent) | 0.77% |  |
Debt repaid | $ 88,899 | $ 66,714 | $ 8,144
Fixed Rate Mortgage Loans Issued 2016 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from debt issuance | $ 38,800 |  |
Weighted average interest rate on debt outstanding (as percent) | 4.68% |  |
Number of properties acquired | property | 3 |  |
Fixed Rate Mortgage Loans Issued 2016 [Member] | Mortgage notes payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate on debt outstanding (as percent) | 6.06% |  |
Debt repaid | $ 79,383 |  |
Variable Rate Mortgages Issued 2016 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from debt issuance | $ 39,905 |  |
Variable Rate Mortgages Issued 2016 [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Libor rate (as percent) | 2.35% |  |
Variable Rate Mortgages Issued 2016 [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Libor rate (as percent) | 2.75% |  |

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- Definition The cash inflow from a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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