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Commitments and Contingencies - Legacy Corner Apartments (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 12, 2017 | Sep. 30, 2017 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency accrual |  |  |  | $ 3,000,000 |
Compensatory Damages [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Damages awarded | $ 6,000,000 |  |  |  |
Punitive Damages [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Damages awarded | 6,000,000 |  |  |  |
Legacy Corner Apartments Litigation [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency accrual |  |  |  | $ 3,000,000 | $ 0
Estimate of possible loss | $ 6,000,000 |  |  |  |
Loss contingency accrual, period increase (decrease) |  | $ 2,447,000 |  |  |
Loss contingency accrual, payments |  |  | $ 553,000 |  |

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