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Basis of Presentation, Consolidation, Investments in Joint Ventures, and Noncontrolling Interests - Additional Information (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 28, 2018 USD ($) | Sep. 30, 2019 USD ($) joint_venture shares | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) joint_venture shares | Dec. 31, 2018 shares
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Incremental expense |  | $ 400 |  |  | $ 1,400 |
Variable interest entity, number of entities | joint_venture |  | 2 |  |  | 2 |
Variable interest entity, consolidated, carrying amount, liabilities |  | $ 56,000 |  |  | $ 56,000 |
Variable interest entity, consolidated, carrying amount, assets |  | $ 114,200 |  |  | $ 114,200 |
Limited partners' capital account, units outstanding (in shares) | shares |  | 2,110,037 |  |  | 2,110,037 | 2,035,349
Accounting Standards Update 2016-02 |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Incremental expense |  | $ 1,300 |  |  | $ 3,900 |
Redeemable Noncontrolling Interests |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Noncontrolling interest, decrease from redemptions or purchase of interests | $ 22,000 |  | $ 0 | $ 22,461 |  |
Operating Partnership |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent (as percent) |  | 97.50% |  |  | 97.50% | 97.60%
Noncontrolling interest, ownership percentage by noncontrolling owners (as percent) |  | 2.50% |  |  | 2.50% | 2.40%

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